Finding the Fourth Proportional to 12,691.80, 19,042.56 and 5,294.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,691.80 : 19,042.56 = 5,294.16 : x
2. Step 2: Convert to fraction form
   12,691.80/19,042.56 = 5,294.16/x
3. Step 3: Cross multiply
   12,691.80x = 19,042.56 × 5,294.16
4. Step 4: Simplify right side
   12,691.80x = 100,814,359.45
5. Step 5: Solve for x
   x = 100,814,359.45/12,691.80
6. Step 6: Final answer
   x = 7,943.27