Finding the Fourth Proportional to 12,564.56, 17,339.31 and 6,899.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,564.56 : 17,339.31 = 6,899.55 : x
2. Step 2: Convert to fraction form
   12,564.56/17,339.31 = 6,899.55/x
3. Step 3: Cross multiply
   12,564.56x = 17,339.31 × 6,899.55
4. Step 4: Simplify right side
   12,564.56x = 119,633,436.31
5. Step 5: Solve for x
   x = 119,633,436.31/12,564.56
6. Step 6: Final answer
   x = 9,521.50