Finding the Fourth Proportional to 12,985.31, 17,916.59 and 7,677.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,985.31 : 17,916.59 = 7,677.18 : x
2. Step 2: Convert to fraction form
   12,985.31/17,916.59 = 7,677.18/x
3. Step 3: Cross multiply
   12,985.31x = 17,916.59 × 7,677.18
4. Step 4: Simplify right side
   12,985.31x = 137,548,905.61
5. Step 5: Solve for x
   x = 137,548,905.61/12,985.31
6. Step 6: Final answer
   x = 10,592.65