Finding the Fourth Proportional to 12,177.30, 18,258.55 and 4,772.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,177.30 : 18,258.55 = 4,772.89 : x
2. Step 2: Convert to fraction form
   12,177.30/18,258.55 = 4,772.89/x
3. Step 3: Cross multiply
   12,177.30x = 18,258.55 × 4,772.89
4. Step 4: Simplify right side
   12,177.30x = 87,146,061.60
5. Step 5: Solve for x
   x = 87,146,061.60/12,177.30
6. Step 6: Final answer
   x = 7,156.43