Finding the Fourth Proportional to 2,978.27, 4,108.13 and 1,917.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.27 : 4,108.13 = 1,917.42 : x
2. Step 2: Convert to fraction form
   2,978.27/4,108.13 = 1,917.42/x
3. Step 3: Cross multiply
   2,978.27x = 4,108.13 × 1,917.42
4. Step 4: Simplify right side
   2,978.27x = 7,876,992.82
5. Step 5: Solve for x
   x = 7,876,992.82/2,978.27
6. Step 6: Final answer
   x = 2,644.82