Finding the Fourth Proportional to 12,488.56, 17,234.16 and 6,899.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.56 : 17,234.16 = 6,899.60 : x
2. Step 2: Convert to fraction form
   12,488.56/17,234.16 = 6,899.60/x
3. Step 3: Cross multiply
   12,488.56x = 17,234.16 × 6,899.60
4. Step 4: Simplify right side
   12,488.56x = 118,908,810.34
5. Step 5: Solve for x
   x = 118,908,810.34/12,488.56
6. Step 6: Final answer
   x = 9,521.42