Finding the Fourth Proportional to 9,361.84, 12,921.55 and 5,385.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,361.84 : 12,921.55 = 5,385.25 : x
2. Step 2: Convert to fraction form
   9,361.84/12,921.55 = 5,385.25/x
3. Step 3: Cross multiply
   9,361.84x = 12,921.55 × 5,385.25
4. Step 4: Simplify right side
   9,361.84x = 69,585,777.14
5. Step 5: Solve for x
   x = 69,585,777.14/9,361.84
6. Step 6: Final answer
   x = 7,432.92