Finding the Fourth Proportional to 76,971.01, 106,221.80 and 42,978.34

Step by Step Solution

1. Step 1: Write the proportion equation
   76,971.01 : 106,221.80 = 42,978.34 : x
2. Step 2: Convert to fraction form
   76,971.01/106,221.80 = 42,978.34/x
3. Step 3: Cross multiply
   76,971.01x = 106,221.80 × 42,978.34
4. Step 4: Simplify right side
   76,971.01x = 4,565,236,635.81
5. Step 5: Solve for x
   x = 4,565,236,635.81/76,971.01
6. Step 6: Final answer
   x = 59,311.12