Finding the Fourth Proportional to 12,387.78, 17,099.82 and 9,047.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,387.78 : 17,099.82 = 9,047.88 : x
2. Step 2: Convert to fraction form
   12,387.78/17,099.82 = 9,047.88/x
3. Step 3: Cross multiply
   12,387.78x = 17,099.82 × 9,047.88
4. Step 4: Simplify right side
   12,387.78x = 154,717,119.38
5. Step 5: Solve for x
   x = 154,717,119.38/12,387.78
6. Step 6: Final answer
   x = 12,489.50