Finding the Fourth Proportional to 12,155.56, 16,781.30 and 8,398.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.56 : 16,781.30 = 8,398.95 : x
2. Step 2: Convert to fraction form
   12,155.56/16,781.30 = 8,398.95/x
3. Step 3: Cross multiply
   12,155.56x = 16,781.30 × 8,398.95
4. Step 4: Simplify right side
   12,155.56x = 140,945,314.67
5. Step 5: Solve for x
   x = 140,945,314.67/12,155.56
6. Step 6: Final answer
   x = 11,595.13