Finding the Fourth Proportional to 12,488.66, 17,238.04 and 7,187.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.66 : 17,238.04 = 7,187.21 : x
2. Step 2: Convert to fraction form
   12,488.66/17,238.04 = 7,187.21/x
3. Step 3: Cross multiply
   12,488.66x = 17,238.04 × 7,187.21
4. Step 4: Simplify right side
   12,488.66x = 123,893,309.31
5. Step 5: Solve for x
   x = 123,893,309.31/12,488.66
6. Step 6: Final answer
   x = 9,920.47