Finding the Fourth Proportional to 12,454.56, 18,590.76 and 10,978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,454.56 : 18,590.76 = 10,978.38 : x
2. Step 2: Convert to fraction form
   12,454.56/18,590.76 = 10,978.38/x
3. Step 3: Cross multiply
   12,454.56x = 18,590.76 × 10,978.38
4. Step 4: Simplify right side
   12,454.56x = 204,096,427.77
5. Step 5: Solve for x
   x = 204,096,427.77/12,454.56
6. Step 6: Final answer
   x = 16,387.29