Finding the Fourth Proportional to 99,508,883,078.70, 136,591,298,111.83 and 87,978,739,142.70

Step by Step Solution

1. Step 1: Write the proportion equation
   99,508,883,078.70 : 136,591,298,111.83 = 87,978,739,142.70 : x
2. Step 2: Convert to fraction form
   99,508,883,078.70/136,591,298,111.83 = 87,978,739,142.70/x
3. Step 3: Cross multiply
   99,508,883,078.70x = 136,591,298,111.83 × 87,978,739,142.70
4. Step 4: Simplify right side
   99,508,883,078.70x = 12,017,130,185,744,009,134,080
5. Step 5: Solve for x
   x = 12,017,130,185,744,009,134,080/99,508,883,078.70
6. Step 6: Final answer
   x = 120,764,396,242.29