Finding the Fourth Proportional to 8,917.43, 12,309.15 and 5,142.11

Step by Step Solution

1. Step 1: Write the proportion equation
   8,917.43 : 12,309.15 = 5,142.11 : x
2. Step 2: Convert to fraction form
   8,917.43/12,309.15 = 5,142.11/x
3. Step 3: Cross multiply
   8,917.43x = 12,309.15 × 5,142.11
4. Step 4: Simplify right side
   8,917.43x = 63,295,003.31
5. Step 5: Solve for x
   x = 63,295,003.31/8,917.43
6. Step 6: Final answer
   x = 7,097.90