Finding the Fourth Proportional to 12,808.59, 17,672.84 and 7,772.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.59 : 17,672.84 = 7,772.69 : x
2. Step 2: Convert to fraction form
   12,808.59/17,672.84 = 7,772.69/x
3. Step 3: Cross multiply
   12,808.59x = 17,672.84 × 7,772.69
4. Step 4: Simplify right side
   12,808.59x = 137,365,563.07
5. Step 5: Solve for x
   x = 137,365,563.07/12,808.59
6. Step 6: Final answer
   x = 10,724.49