Finding the Fourth Proportional to 12,492.27, 17,240.18 and 7,189.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,492.27 : 17,240.18 = 7,189.20 : x
2. Step 2: Convert to fraction form
   12,492.27/17,240.18 = 7,189.20/x
3. Step 3: Cross multiply
   12,492.27x = 17,240.18 × 7,189.20
4. Step 4: Simplify right side
   12,492.27x = 123,943,066.11
5. Step 5: Solve for x
   x = 123,943,066.11/12,492.27
6. Step 6: Final answer
   x = 9,921.58