Finding the Fourth Proportional to 12,816.18, 17,688.12 and 7,513.14

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.18 : 17,688.12 = 7,513.14 : x
2. Step 2: Convert to fraction form
   12,816.18/17,688.12 = 7,513.14/x
3. Step 3: Cross multiply
   12,816.18x = 17,688.12 × 7,513.14
4. Step 4: Simplify right side
   12,816.18x = 132,893,321.90
5. Step 5: Solve for x
   x = 132,893,321.90/12,816.18
6. Step 6: Final answer
   x = 10,369.18