Finding the Fourth Proportional to 117,129.12, 161,638.56 and 63,414.72

Step by Step Solution

1. Step 1: Write the proportion equation
   117,129.12 : 161,638.56 = 63,414.72 : x
2. Step 2: Convert to fraction form
   117,129.12/161,638.56 = 63,414.72/x
3. Step 3: Cross multiply
   117,129.12x = 161,638.56 × 63,414.72
4. Step 4: Simplify right side
   117,129.12x = 10,250,264,023.60
5. Step 5: Solve for x
   x = 10,250,264,023.60/117,129.12
6. Step 6: Final answer
   x = 87,512.52