Finding the Fourth Proportional to 129,078.15, 193,693.37 and 54,211.47

Step by Step Solution

1. Step 1: Write the proportion equation
   129,078.15 : 193,693.37 = 54,211.47 : x
2. Step 2: Convert to fraction form
   129,078.15/193,693.37 = 54,211.47/x
3. Step 3: Cross multiply
   129,078.15x = 193,693.37 × 54,211.47
4. Step 4: Simplify right side
   129,078.15x = 10,500,402,045.90
5. Step 5: Solve for x
   x = 10,500,402,045.90/129,078.15
6. Step 6: Final answer
   x = 81,349.18