Finding the Fourth Proportional to 9,397.45, 12,938.95 and 7,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,397.45 : 12,938.95 = 7,978.20 : x
2. Step 2: Convert to fraction form
   9,397.45/12,938.95 = 7,978.20/x
3. Step 3: Cross multiply
   9,397.45x = 12,938.95 × 7,978.20
4. Step 4: Simplify right side
   9,397.45x = 103,229,530.89
5. Step 5: Solve for x
   x = 103,229,530.89/9,397.45
6. Step 6: Final answer
   x = 10,984.84