Finding the Fourth Proportional to 90,435.78, 124,657.56 and 71,284.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,435.78 : 124,657.56 = 71,284.50 : x
2. Step 2: Convert to fraction form
   90,435.78/124,657.56 = 71,284.50/x
3. Step 3: Cross multiply
   90,435.78x = 124,657.56 × 71,284.50
4. Step 4: Simplify right side
   90,435.78x = 8,886,151,835.82
5. Step 5: Solve for x
   x = 8,886,151,835.82/90,435.78
6. Step 6: Final answer
   x = 98,259.25