Finding the Fourth Proportional to 12,875.46, 19,280.16 and 8,921.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,875.46 : 19,280.16 = 8,921.10 : x
2. Step 2: Convert to fraction form
   12,875.46/19,280.16 = 8,921.10/x
3. Step 3: Cross multiply
   12,875.46x = 19,280.16 × 8,921.10
4. Step 4: Simplify right side
   12,875.46x = 172,000,235.38
5. Step 5: Solve for x
   x = 172,000,235.38/12,875.46
6. Step 6: Final answer
   x = 13,358.76