Finding the Fourth Proportional to 12,155.04, 18,227.30 and 5,138.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.04 : 18,227.30 = 5,138.15 : x
2. Step 2: Convert to fraction form
   12,155.04/18,227.30 = 5,138.15/x
3. Step 3: Cross multiply
   12,155.04x = 18,227.30 × 5,138.15
4. Step 4: Simplify right side
   12,155.04x = 93,654,484.67
5. Step 5: Solve for x
   x = 93,654,484.67/12,155.04
6. Step 6: Final answer
   x = 7,704.99