Finding the Fourth Proportional to 25,401.78, 35,032.71 and 15,328.08

Step by Step Solution

1. Step 1: Write the proportion equation
   25,401.78 : 35,032.71 = 15,328.08 : x
2. Step 2: Convert to fraction form
   25,401.78/35,032.71 = 15,328.08/x
3. Step 3: Cross multiply
   25,401.78x = 35,032.71 × 15,328.08
4. Step 4: Simplify right side
   25,401.78x = 536,984,181.50
5. Step 5: Solve for x
   x = 536,984,181.50/25,401.78
6. Step 6: Final answer
   x = 21,139.63