Finding the Fourth Proportional to 15,498.96, 21,388.71 and 8,425.38

Step by Step Solution

1. Step 1: Write the proportion equation
   15,498.96 : 21,388.71 = 8,425.38 : x
2. Step 2: Convert to fraction form
   15,498.96/21,388.71 = 8,425.38/x
3. Step 3: Cross multiply
   15,498.96x = 21,388.71 × 8,425.38
4. Step 4: Simplify right side
   15,498.96x = 180,208,009.46
5. Step 5: Solve for x
   x = 180,208,009.46/15,498.96
6. Step 6: Final answer
   x = 11,627.10