Finding the Fourth Proportional to 12,308.30, 16,988.56 and 8,437.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,308.30 : 16,988.56 = 8,437.31 : x
2. Step 2: Convert to fraction form
   12,308.30/16,988.56 = 8,437.31/x
3. Step 3: Cross multiply
   12,308.30x = 16,988.56 × 8,437.31
4. Step 4: Simplify right side
   12,308.30x = 143,337,641.14
5. Step 5: Solve for x
   x = 143,337,641.14/12,308.30
6. Step 6: Final answer
   x = 11,645.61