Finding the Fourth Proportional to 10,685.36, 16,025.88 and 8,948.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,685.36 : 16,025.88 = 8,948.72 : x
2. Step 2: Convert to fraction form
   10,685.36/16,025.88 = 8,948.72/x
3. Step 3: Cross multiply
   10,685.36x = 16,025.88 × 8,948.72
4. Step 4: Simplify right side
   10,685.36x = 143,411,112.87
5. Step 5: Solve for x
   x = 143,411,112.87/10,685.36
6. Step 6: Final answer
   x = 13,421.27