Finding the Fourth Proportional to 9,363.92, 12,921.52 and 5,385.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,363.92 : 12,921.52 = 5,385.04 : x
2. Step 2: Convert to fraction form
   9,363.92/12,921.52 = 5,385.04/x
3. Step 3: Cross multiply
   9,363.92x = 12,921.52 × 5,385.04
4. Step 4: Simplify right side
   9,363.92x = 69,582,902.06
5. Step 5: Solve for x
   x = 69,582,902.06/9,363.92
6. Step 6: Final answer
   x = 7,430.96