Finding the Fourth Proportional to 9,339.72, 12,883.81 and 5,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,339.72 : 12,883.81 = 5,978.92 : x
2. Step 2: Convert to fraction form
   9,339.72/12,883.81 = 5,978.92/x
3. Step 3: Cross multiply
   9,339.72x = 12,883.81 × 5,978.92
4. Step 4: Simplify right side
   9,339.72x = 77,031,254.34
5. Step 5: Solve for x
   x = 77,031,254.34/9,339.72
6. Step 6: Final answer
   x = 8,247.70