Finding the Fourth Proportional to 9,397.82, 12,939.48 and 7,978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,397.82 : 12,939.48 = 7,978.55 : x
2. Step 2: Convert to fraction form
   9,397.82/12,939.48 = 7,978.55/x
3. Step 3: Cross multiply
   9,397.82x = 12,939.48 × 7,978.55
4. Step 4: Simplify right side
   9,397.82x = 103,238,248.26
5. Step 5: Solve for x
   x = 103,238,248.26/9,397.82
6. Step 6: Final answer
   x = 10,985.34