Finding the Fourth Proportional to 1,978.17, 2,726.49 and 1,535.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.17 : 2,726.49 = 1,535.23 : x
2. Step 2: Convert to fraction form
   1,978.17/2,726.49 = 1,535.23/x
3. Step 3: Cross multiply
   1,978.17x = 2,726.49 × 1,535.23
4. Step 4: Simplify right side
   1,978.17x = 4,185,789.24
5. Step 5: Solve for x
   x = 4,185,789.24/1,978.17
6. Step 6: Final answer
   x = 2,115.99