Finding the Fourth Proportional to 9,363.42, 12,922.20 and 5,385.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,363.42 : 12,922.20 = 5,385.78 : x
2. Step 2: Convert to fraction form
   9,363.42/12,922.20 = 5,385.78/x
3. Step 3: Cross multiply
   9,363.42x = 12,922.20 × 5,385.78
4. Step 4: Simplify right side
   9,363.42x = 69,596,126.32
5. Step 5: Solve for x
   x = 69,596,126.32/9,363.42
6. Step 6: Final answer
   x = 7,432.77