Finding the Fourth Proportional to 10,978.16, 15,147.96 and 6,260.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.16 : 15,147.96 = 6,260.72 : x
2. Step 2: Convert to fraction form
   10,978.16/15,147.96 = 6,260.72/x
3. Step 3: Cross multiply
   10,978.16x = 15,147.96 × 6,260.72
4. Step 4: Simplify right side
   10,978.16x = 94,837,136.13
5. Step 5: Solve for x
   x = 94,837,136.13/10,978.16
6. Step 6: Final answer
   x = 8,638.71