Finding the Fourth Proportional to 9,363.30, 12,921.34 and 5,385.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,363.30 : 12,921.34 = 5,385.69 : x
2. Step 2: Convert to fraction form
   9,363.30/12,921.34 = 5,385.69/x
3. Step 3: Cross multiply
   9,363.30x = 12,921.34 × 5,385.69
4. Step 4: Simplify right side
   9,363.30x = 69,590,331.62
5. Step 5: Solve for x
   x = 69,590,331.62/9,363.30
6. Step 6: Final answer
   x = 7,432.24