Finding the Fourth Proportional to 12,884.16, 17,779.76 and 7,507.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,884.16 : 17,779.76 = 7,507.78 : x
2. Step 2: Convert to fraction form
   12,884.16/17,779.76 = 7,507.78/x
3. Step 3: Cross multiply
   12,884.16x = 17,779.76 × 7,507.78
4. Step 4: Simplify right side
   12,884.16x = 133,486,545.30
5. Step 5: Solve for x
   x = 133,486,545.30/12,884.16
6. Step 6: Final answer
   x = 10,360.52