Finding the Fourth Proportional to 12,808.31, 17,672.45 and 7,772.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.31 : 17,672.45 = 7,772.41 : x
2. Step 2: Convert to fraction form
   12,808.31/17,672.45 = 7,772.41/x
3. Step 3: Cross multiply
   12,808.31x = 17,672.45 × 7,772.41
4. Step 4: Simplify right side
   12,808.31x = 137,357,554.05
5. Step 5: Solve for x
   x = 137,357,554.05/12,808.31
6. Step 6: Final answer
   x = 10,724.10