Finding the Fourth Proportional to 88,128.31, 121,613.55 and 47,840.71

Step by Step Solution

1. Step 1: Write the proportion equation
   88,128.31 : 121,613.55 = 47,840.71 : x
2. Step 2: Convert to fraction form
   88,128.31/121,613.55 = 47,840.71/x
3. Step 3: Cross multiply
   88,128.31x = 121,613.55 × 47,840.71
4. Step 4: Simplify right side
   88,128.31x = 5,818,078,577.62
5. Step 5: Solve for x
   x = 5,818,078,577.62/88,128.31
6. Step 6: Final answer
   x = 66,018.27