Finding the Fourth Proportional to 1,259.24, 1,886.52 and 868.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.24 : 1,886.52 = 868.78 : x
2. Step 2: Convert to fraction form
   1,259.24/1,886.52 = 868.78/x
3. Step 3: Cross multiply
   1,259.24x = 1,886.52 × 868.78
4. Step 4: Simplify right side
   1,259.24x = 1,638,970.85
5. Step 5: Solve for x
   x = 1,638,970.85/1,259.24
6. Step 6: Final answer
   x = 1,301.56