Finding the Fourth Proportional to 1,759.92, 2,641.60 and 786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,759.92 : 2,641.60 = 786.72 : x
2. Step 2: Convert to fraction form
   1,759.92/2,641.60 = 786.72/x
3. Step 3: Cross multiply
   1,759.92x = 2,641.60 × 786.72
4. Step 4: Simplify right side
   1,759.92x = 2,078,199.55
5. Step 5: Solve for x
   x = 2,078,199.55/1,759.92
6. Step 6: Final answer
   x = 1,180.85