Finding the Fourth Proportional to 1,865.88, 2,574.72 and 1,079.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,865.88 : 2,574.72 = 1,079.78 : x
2. Step 2: Convert to fraction form
   1,865.88/2,574.72 = 1,079.78/x
3. Step 3: Cross multiply
   1,865.88x = 2,574.72 × 1,079.78
4. Step 4: Simplify right side
   1,865.88x = 2,780,118.29
5. Step 5: Solve for x
   x = 2,780,118.29/1,865.88
6. Step 6: Final answer
   x = 1,489.98