Finding the Fourth Proportional to 1,250.88, 1,725.72 and 778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,250.88 : 1,725.72 = 778.50 : x
2. Step 2: Convert to fraction form
   1,250.88/1,725.72 = 778.50/x
3. Step 3: Cross multiply
   1,250.88x = 1,725.72 × 778.50
4. Step 4: Simplify right side
   1,250.88x = 1,343,473.02
5. Step 5: Solve for x
   x = 1,343,473.02/1,250.88
6. Step 6: Final answer
   x = 1,074.02