Finding the Fourth Proportional to 9,320.70, 12,863.30 and 5,342.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.70 : 12,863.30 = 5,342.79 : x
2. Step 2: Convert to fraction form
   9,320.70/12,863.30 = 5,342.79/x
3. Step 3: Cross multiply
   9,320.70x = 12,863.30 × 5,342.79
4. Step 4: Simplify right side
   9,320.70x = 68,725,883.89
5. Step 5: Solve for x
   x = 68,725,883.89/9,320.70
6. Step 6: Final answer
   x = 7,373.47