Finding the Fourth Proportional to 12,639.24, 17,439.30 and 7,602.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,639.24 : 17,439.30 = 7,602.12 : x
2. Step 2: Convert to fraction form
   12,639.24/17,439.30 = 7,602.12/x
3. Step 3: Cross multiply
   12,639.24x = 17,439.30 × 7,602.12
4. Step 4: Simplify right side
   12,639.24x = 132,575,651.32
5. Step 5: Solve for x
   x = 132,575,651.32/12,639.24
6. Step 6: Final answer
   x = 10,489.21