Finding the Fourth Proportional to 12,705.85, 17,532.32 and 7,039.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,705.85 : 17,532.32 = 7,039.20 : x
2. Step 2: Convert to fraction form
   12,705.85/17,532.32 = 7,039.20/x
3. Step 3: Cross multiply
   12,705.85x = 17,532.32 × 7,039.20
4. Step 4: Simplify right side
   12,705.85x = 123,413,506.94
5. Step 5: Solve for x
   x = 123,413,506.94/12,705.85
6. Step 6: Final answer
   x = 9,713.12