Finding the Fourth Proportional to 12,678.30, 17,489.02 and 7,372.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.30 : 17,489.02 = 7,372.52 : x
2. Step 2: Convert to fraction form
   12,678.30/17,489.02 = 7,372.52/x
3. Step 3: Cross multiply
   12,678.30x = 17,489.02 × 7,372.52
4. Step 4: Simplify right side
   12,678.30x = 128,938,149.73
5. Step 5: Solve for x
   x = 128,938,149.73/12,678.30
6. Step 6: Final answer
   x = 10,169.99