Finding the Fourth Proportional to 12,384.18, 17,092.65 and 8,406.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,384.18 : 17,092.65 = 8,406.57 : x
2. Step 2: Convert to fraction form
   12,384.18/17,092.65 = 8,406.57/x
3. Step 3: Cross multiply
   12,384.18x = 17,092.65 × 8,406.57
4. Step 4: Simplify right side
   12,384.18x = 143,690,558.71
5. Step 5: Solve for x
   x = 143,690,558.71/12,384.18
6. Step 6: Final answer
   x = 11,602.75