Finding the Fourth Proportional to 1,978.71, 2,726.10 and 1,585.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.71 : 2,726.10 = 1,585.05 : x
2. Step 2: Convert to fraction form
   1,978.71/2,726.10 = 1,585.05/x
3. Step 3: Cross multiply
   1,978.71x = 2,726.10 × 1,585.05
4. Step 4: Simplify right side
   1,978.71x = 4,321,004.81
5. Step 5: Solve for x
   x = 4,321,004.81/1,978.71
6. Step 6: Final answer
   x = 2,183.75