Finding the Fourth Proportional to 12,585.55, 17,371.72 and 7,806.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,585.55 : 17,371.72 = 7,806.96 : x
2. Step 2: Convert to fraction form
   12,585.55/17,371.72 = 7,806.96/x
3. Step 3: Cross multiply
   12,585.55x = 17,371.72 × 7,806.96
4. Step 4: Simplify right side
   12,585.55x = 135,620,323.17
5. Step 5: Solve for x
   x = 135,620,323.17/12,585.55
6. Step 6: Final answer
   x = 10,775.88