Finding the Fourth Proportional to 12,488.59, 17,216.38 and 7,705.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.59 : 17,216.38 = 7,705.34 : x
2. Step 2: Convert to fraction form
   12,488.59/17,216.38 = 7,705.34/x
3. Step 3: Cross multiply
   12,488.59x = 17,216.38 × 7,705.34
4. Step 4: Simplify right side
   12,488.59x = 132,658,061.47
5. Step 5: Solve for x
   x = 132,658,061.47/12,488.59
6. Step 6: Final answer
   x = 10,622.34