Finding the Fourth Proportional to 90,436.78, 124,658.94 and 71,285.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,436.78 : 124,658.94 = 71,285.50 : x
2. Step 2: Convert to fraction form
   90,436.78/124,658.94 = 71,285.50/x
3. Step 3: Cross multiply
   90,436.78x = 124,658.94 × 71,285.50
4. Step 4: Simplify right side
   90,436.78x = 8,886,374,867.37
5. Step 5: Solve for x
   x = 8,886,374,867.37/90,436.78
6. Step 6: Final answer
   x = 98,260.63