Finding the Fourth Proportional to 12,817.70, 17,687.92 and 7,152.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,817.70 : 17,687.92 = 7,152.15 : x
2. Step 2: Convert to fraction form
   12,817.70/17,687.92 = 7,152.15/x
3. Step 3: Cross multiply
   12,817.70x = 17,687.92 × 7,152.15
4. Step 4: Simplify right side
   12,817.70x = 126,506,657.03
5. Step 5: Solve for x
   x = 126,506,657.03/12,817.70
6. Step 6: Final answer
   x = 9,869.68