Finding the Fourth Proportional to 1,581.78, 2,377.98 and 1,275.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.78 : 2,377.98 = 1,275.78 : x
2. Step 2: Convert to fraction form
   1,581.78/2,377.98 = 1,275.78/x
3. Step 3: Cross multiply
   1,581.78x = 2,377.98 × 1,275.78
4. Step 4: Simplify right side
   1,581.78x = 3,033,779.32
5. Step 5: Solve for x
   x = 3,033,779.32/1,581.78
6. Step 6: Final answer
   x = 1,917.95