Finding the Fourth Proportional to 2,142.42, 2,957.93 and 1,917.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.42 : 2,957.93 = 1,917.96 : x
2. Step 2: Convert to fraction form
   2,142.42/2,957.93 = 1,917.96/x
3. Step 3: Cross multiply
   2,142.42x = 2,957.93 × 1,917.96
4. Step 4: Simplify right side
   2,142.42x = 5,673,181.83
5. Step 5: Solve for x
   x = 5,673,181.83/2,142.42
6. Step 6: Final answer
   x = 2,648.03