Finding the Fourth Proportional to 9,708.91, 13,398.79 and 5,729.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,708.91 : 13,398.79 = 5,729.94 : x
2. Step 2: Convert to fraction form
   9,708.91/13,398.79 = 5,729.94/x
3. Step 3: Cross multiply
   9,708.91x = 13,398.79 × 5,729.94
4. Step 4: Simplify right side
   9,708.91x = 76,774,275.31
5. Step 5: Solve for x
   x = 76,774,275.31/9,708.91
6. Step 6: Final answer
   x = 7,907.61