Finding the Fourth Proportional to 78,557.31, 117,854.42 and 25,966.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,557.31 : 117,854.42 = 25,966.79 : x
2. Step 2: Convert to fraction form
   78,557.31/117,854.42 = 25,966.79/x
3. Step 3: Cross multiply
   78,557.31x = 117,854.42 × 25,966.79
4. Step 4: Simplify right side
   78,557.31x = 3,060,300,844.88
5. Step 5: Solve for x
   x = 3,060,300,844.88/78,557.31
6. Step 6: Final answer
   x = 38,956.29