Finding the Fourth Proportional to 1,581.93, 2,179.98 and 1,139.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.93 : 2,179.98 = 1,139.00 : x
2. Step 2: Convert to fraction form
   1,581.93/2,179.98 = 1,139.00/x
3. Step 3: Cross multiply
   1,581.93x = 2,179.98 × 1,139.00
4. Step 4: Simplify right side
   1,581.93x = 2,482,986.32
5. Step 5: Solve for x
   x = 2,482,986.32/1,581.93
6. Step 6: Final answer
   x = 1,569.59