Finding the Fourth Proportional to 2,079.90, 3,124.35 and 1,258.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.90 : 3,124.35 = 1,258.56 : x
2. Step 2: Convert to fraction form
   2,079.90/3,124.35 = 1,258.56/x
3. Step 3: Cross multiply
   2,079.90x = 3,124.35 × 1,258.56
4. Step 4: Simplify right side
   2,079.90x = 3,932,181.94
5. Step 5: Solve for x
   x = 3,932,181.94/2,079.90
6. Step 6: Final answer
   x = 1,890.56