Finding the Fourth Proportional to 25,730.04, 35,499.42 and 15,120.12

Step by Step Solution

1. Step 1: Write the proportion equation
   25,730.04 : 35,499.42 = 15,120.12 : x
2. Step 2: Convert to fraction form
   25,730.04/35,499.42 = 15,120.12/x
3. Step 3: Cross multiply
   25,730.04x = 35,499.42 × 15,120.12
4. Step 4: Simplify right side
   25,730.04x = 536,755,490.33
5. Step 5: Solve for x
   x = 536,755,490.33/25,730.04
6. Step 6: Final answer
   x = 20,861.04