Finding the Fourth Proportional to 81,139.57, 121,715.42 and 25,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   81,139.57 : 121,715.42 = 25,018.72 : x
2. Step 2: Convert to fraction form
   81,139.57/121,715.42 = 25,018.72/x
3. Step 3: Cross multiply
   81,139.57x = 121,715.42 × 25,018.72
4. Step 4: Simplify right side
   81,139.57x = 3,045,164,012.66
5. Step 5: Solve for x
   x = 3,045,164,012.66/81,139.57
6. Step 6: Final answer
   x = 37,529.95