Finding the Fourth Proportional to 12,488.47, 17,237.79 and 7,187.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.47 : 17,237.79 = 7,187.02 : x
2. Step 2: Convert to fraction form
   12,488.47/17,237.79 = 7,187.02/x
3. Step 3: Cross multiply
   12,488.47x = 17,237.79 × 7,187.02
4. Step 4: Simplify right side
   12,488.47x = 123,888,298.39
5. Step 5: Solve for x
   x = 123,888,298.39/12,488.47
6. Step 6: Final answer
   x = 9,920.22