Finding the Fourth Proportional to 12,987.78, 17,916.38 and 7,673.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987.78 : 17,916.38 = 7,673.38 : x
2. Step 2: Convert to fraction form
   12,987.78/17,916.38 = 7,673.38/x
3. Step 3: Cross multiply
   12,987.78x = 17,916.38 × 7,673.38
4. Step 4: Simplify right side
   12,987.78x = 137,479,191.96
5. Step 5: Solve for x
   x = 137,479,191.96/12,987.78
6. Step 6: Final answer
   x = 10,585.27