Finding the Fourth Proportional to 25,499.71, 38,272.02 and 13,663.18

Step by Step Solution

1. Step 1: Write the proportion equation
   25,499.71 : 38,272.02 = 13,663.18 : x
2. Step 2: Convert to fraction form
   25,499.71/38,272.02 = 13,663.18/x
3. Step 3: Cross multiply
   25,499.71x = 38,272.02 × 13,663.18
4. Step 4: Simplify right side
   25,499.71x = 522,917,498.22
5. Step 5: Solve for x
   x = 522,917,498.22/25,499.71
6. Step 6: Final answer
   x = 20,506.80