Finding the Fourth Proportional to 90,434.78, 124,656.18 and 71,283.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,434.78 : 124,656.18 = 71,283.50 : x
2. Step 2: Convert to fraction form
   90,434.78/124,656.18 = 71,283.50/x
3. Step 3: Cross multiply
   90,434.78x = 124,656.18 × 71,283.50
4. Step 4: Simplify right side
   90,434.78x = 8,885,928,807.03
5. Step 5: Solve for x
   x = 8,885,928,807.03/90,434.78
6. Step 6: Final answer
   x = 98,257.87