Finding the Fourth Proportional to 72,120.02, 99,523.92 and 40,288.82

Step by Step Solution

1. Step 1: Write the proportion equation
   72,120.02 : 99,523.92 = 40,288.82 : x
2. Step 2: Convert to fraction form
   72,120.02/99,523.92 = 40,288.82/x
3. Step 3: Cross multiply
   72,120.02x = 99,523.92 × 40,288.82
4. Step 4: Simplify right side
   72,120.02x = 4,009,701,298.57
5. Step 5: Solve for x
   x = 4,009,701,298.57/72,120.02
6. Step 6: Final answer
   x = 55,597.62