Finding the Fourth Proportional to 1,781.80, 2,665.50 and 1,393

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.80 : 2,665.50 = 1,393 : x
2. Step 2: Convert to fraction form
   1,781.80/2,665.50 = 1,393/x
3. Step 3: Cross multiply
   1,781.80x = 2,665.50 × 1,393
4. Step 4: Simplify right side
   1,781.80x = 3,713,041.50
5. Step 5: Solve for x
   x = 3,713,041.50/1,781.80
6. Step 6: Final answer
   x = 2,083.87