Finding the Fourth Proportional to 25,653.15, 35,401.32 and 15,578.91

Step by Step Solution

1. Step 1: Write the proportion equation
   25,653.15 : 35,401.32 = 15,578.91 : x
2. Step 2: Convert to fraction form
   25,653.15/35,401.32 = 15,578.91/x
3. Step 3: Cross multiply
   25,653.15x = 35,401.32 × 15,578.91
4. Step 4: Simplify right side
   25,653.15x = 551,513,978.16
5. Step 5: Solve for x
   x = 551,513,978.16/25,653.15
6. Step 6: Final answer
   x = 21,498.88