Finding the Fourth Proportional to 12,492.84, 17,240.79 and 7,188.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,492.84 : 17,240.79 = 7,188.47 : x
2. Step 2: Convert to fraction form
   12,492.84/17,240.79 = 7,188.47/x
3. Step 3: Cross multiply
   12,492.84x = 17,240.79 × 7,188.47
4. Step 4: Simplify right side
   12,492.84x = 123,934,901.69
5. Step 5: Solve for x
   x = 123,934,901.69/12,492.84
6. Step 6: Final answer
   x = 9,920.47