Finding the Fourth Proportional to 2,319.37, 3,479.42 and 780.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,319.37 : 3,479.42 = 780.25 : x
2. Step 2: Convert to fraction form
   2,319.37/3,479.42 = 780.25/x
3. Step 3: Cross multiply
   2,319.37x = 3,479.42 × 780.25
4. Step 4: Simplify right side
   2,319.37x = 2,714,813.55
5. Step 5: Solve for x
   x = 2,714,813.55/2,319.37
6. Step 6: Final answer
   x = 1,170.50