Finding the Fourth Proportional to 12,811.48, 17,680.38 and 7,505.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,811.48 : 17,680.38 = 7,505.56 : x
2. Step 2: Convert to fraction form
   12,811.48/17,680.38 = 7,505.56/x
3. Step 3: Cross multiply
   12,811.48x = 17,680.38 × 7,505.56
4. Step 4: Simplify right side
   12,811.48x = 132,701,152.91
5. Step 5: Solve for x
   x = 132,701,152.91/12,811.48
6. Step 6: Final answer
   x = 10,357.99