Finding the Fourth Proportional to 90,632.08, 125,066.46 and 56,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   90,632.08 : 125,066.46 = 56,638.72 : x
2. Step 2: Convert to fraction form
   90,632.08/125,066.46 = 56,638.72/x
3. Step 3: Cross multiply
   90,632.08x = 125,066.46 × 56,638.72
4. Step 4: Simplify right side
   90,632.08x = 7,083,604,209.33
5. Step 5: Solve for x
   x = 7,083,604,209.33/90,632.08
6. Step 6: Final answer
   x = 78,157.80