Finding the Fourth Proportional to 9,378.76, 12,939.78 and 5,397.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,378.76 : 12,939.78 = 5,397.52 : x
2. Step 2: Convert to fraction form
   9,378.76/12,939.78 = 5,397.52/x
3. Step 3: Cross multiply
   9,378.76x = 12,939.78 × 5,397.52
4. Step 4: Simplify right side
   9,378.76x = 69,842,721.35
5. Step 5: Solve for x
   x = 69,842,721.35/9,378.76
6. Step 6: Final answer
   x = 7,446.90