Finding the Fourth Proportional to 12,816.68, 17,688.60 and 7,513.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.68 : 17,688.60 = 7,513.52 : x
2. Step 2: Convert to fraction form
   12,816.68/17,688.60 = 7,513.52/x
3. Step 3: Cross multiply
   12,816.68x = 17,688.60 × 7,513.52
4. Step 4: Simplify right side
   12,816.68x = 132,903,649.87
5. Step 5: Solve for x
   x = 132,903,649.87/12,816.68
6. Step 6: Final answer
   x = 10,369.58