Finding the Fourth Proportional to 90,499.56, 124,893.60 and 56,528.16

Step by Step Solution

1. Step 1: Write the proportion equation
   90,499.56 : 124,893.60 = 56,528.16 : x
2. Step 2: Convert to fraction form
   90,499.56/124,893.60 = 56,528.16/x
3. Step 3: Cross multiply
   90,499.56x = 124,893.60 × 56,528.16
4. Step 4: Simplify right side
   90,499.56x = 7,060,005,403.78
5. Step 5: Solve for x
   x = 7,060,005,403.78/90,499.56
6. Step 6: Final answer
   x = 78,011.49