Finding the Fourth Proportional to 12,454.11, 17,173.49 and 7,978.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,454.11 : 17,173.49 = 7,978.05 : x
2. Step 2: Convert to fraction form
   12,454.11/17,173.49 = 7,978.05/x
3. Step 3: Cross multiply
   12,454.11x = 17,173.49 × 7,978.05
4. Step 4: Simplify right side
   12,454.11x = 137,010,922.00
5. Step 5: Solve for x
   x = 137,010,922.00/12,454.11
6. Step 6: Final answer
   x = 11,001.26