Finding the Fourth Proportional to 90,760.10, 135,978.15 and 43,909.70

Step by Step Solution

1. Step 1: Write the proportion equation
   90,760.10 : 135,978.15 = 43,909.70 : x
2. Step 2: Convert to fraction form
   90,760.10/135,978.15 = 43,909.70/x
3. Step 3: Cross multiply
   90,760.10x = 135,978.15 × 43,909.70
4. Step 4: Simplify right side
   90,760.10x = 5,970,759,773.06
5. Step 5: Solve for x
   x = 5,970,759,773.06/90,760.10
6. Step 6: Final answer
   x = 65,786.17