Finding the Fourth Proportional to 12,347.12, 17,039.52 and 7,042.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,347.12 : 17,039.52 = 7,042.80 : x
2. Step 2: Convert to fraction form
   12,347.12/17,039.52 = 7,042.80/x
3. Step 3: Cross multiply
   12,347.12x = 17,039.52 × 7,042.80
4. Step 4: Simplify right side
   12,347.12x = 120,005,931.46
5. Step 5: Solve for x
   x = 120,005,931.46/12,347.12
6. Step 6: Final answer
   x = 9,719.35