Finding the Fourth Proportional to 12,492.02, 17,238.50 and 7,188.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,492.02 : 17,238.50 = 7,188.55 : x
2. Step 2: Convert to fraction form
   12,492.02/17,238.50 = 7,188.55/x
3. Step 3: Cross multiply
   12,492.02x = 17,238.50 × 7,188.55
4. Step 4: Simplify right side
   12,492.02x = 123,919,819.18
5. Step 5: Solve for x
   x = 123,919,819.18/12,492.02
6. Step 6: Final answer
   x = 9,919.92