Finding the Fourth Proportional to 12,999.42, 17,939.10 and 7,031.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.42 : 17,939.10 = 7,031.10 : x
2. Step 2: Convert to fraction form
   12,999.42/17,939.10 = 7,031.10/x
3. Step 3: Cross multiply
   12,999.42x = 17,939.10 × 7,031.10
4. Step 4: Simplify right side
   12,999.42x = 126,131,606.01
5. Step 5: Solve for x
   x = 126,131,606.01/12,999.42
6. Step 6: Final answer
   x = 9,702.86