Finding the Fourth Proportional to 9,153.78, 12,632.12 and 5,120.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,153.78 : 12,632.12 = 5,120.55 : x
2. Step 2: Convert to fraction form
   9,153.78/12,632.12 = 5,120.55/x
3. Step 3: Cross multiply
   9,153.78x = 12,632.12 × 5,120.55
4. Step 4: Simplify right side
   9,153.78x = 64,683,376.46
5. Step 5: Solve for x
   x = 64,683,376.46/9,153.78
6. Step 6: Final answer
   x = 7,066.31