Finding the Fourth Proportional to 2,321.58, 3,480.18 and 781.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,321.58 : 3,480.18 = 781.50 : x
2. Step 2: Convert to fraction form
   2,321.58/3,480.18 = 781.50/x
3. Step 3: Cross multiply
   2,321.58x = 3,480.18 × 781.50
4. Step 4: Simplify right side
   2,321.58x = 2,719,760.67
5. Step 5: Solve for x
   x = 2,719,760.67/2,321.58
6. Step 6: Final answer
   x = 1,171.51