Finding the Fourth Proportional to 1,865.88, 2,579.58 and 1,399.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,865.88 : 2,579.58 = 1,399.32 : x
2. Step 2: Convert to fraction form
   1,865.88/2,579.58 = 1,399.32/x
3. Step 3: Cross multiply
   1,865.88x = 2,579.58 × 1,399.32
4. Step 4: Simplify right side
   1,865.88x = 3,609,657.89
5. Step 5: Solve for x
   x = 3,609,657.89/1,865.88
6. Step 6: Final answer
   x = 1,934.56