Finding the Fourth Proportional to 12,678.55, 17,502.53 and 8,436.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.55 : 17,502.53 = 8,436.69 : x
2. Step 2: Convert to fraction form
   12,678.55/17,502.53 = 8,436.69/x
3. Step 3: Cross multiply
   12,678.55x = 17,502.53 × 8,436.69
4. Step 4: Simplify right side
   12,678.55x = 147,663,419.83
5. Step 5: Solve for x
   x = 147,663,419.83/12,678.55
6. Step 6: Final answer
   x = 11,646.71