Finding the Fourth Proportional to 9,378.31, 12,939.96 and 5,600.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,378.31 : 12,939.96 = 5,600.79 : x
2. Step 2: Convert to fraction form
   9,378.31/12,939.96 = 5,600.79/x
3. Step 3: Cross multiply
   9,378.31x = 12,939.96 × 5,600.79
4. Step 4: Simplify right side
   9,378.31x = 72,473,998.57
5. Step 5: Solve for x
   x = 72,473,998.57/9,378.31
6. Step 6: Final answer
   x = 7,727.83