Finding the Fourth Proportional to 12,985.60, 17,915.82 and 7,319.65

Step by Step Solution

1. Step 1: Write the proportion equation
   12,985.60 : 17,915.82 = 7,319.65 : x
2. Step 2: Convert to fraction form
   12,985.60/17,915.82 = 7,319.65/x
3. Step 3: Cross multiply
   12,985.60x = 17,915.82 × 7,319.65
4. Step 4: Simplify right side
   12,985.60x = 131,137,531.86
5. Step 5: Solve for x
   x = 131,137,531.86/12,985.60
6. Step 6: Final answer
   x = 10,098.69