Finding the Fourth Proportional to 9,397.65, 12,939.24 and 7,978.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,397.65 : 12,939.24 = 7,978.53 : x
2. Step 2: Convert to fraction form
   9,397.65/12,939.24 = 7,978.53/x
3. Step 3: Cross multiply
   9,397.65x = 12,939.24 × 7,978.53
4. Step 4: Simplify right side
   9,397.65x = 103,236,114.52
5. Step 5: Solve for x
   x = 103,236,114.52/9,397.65
6. Step 6: Final answer
   x = 10,985.31