Finding the Fourth Proportional to 2,350.55, 3,243.80 and 1,288.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,350.55 : 3,243.80 = 1,288.25 : x
2. Step 2: Convert to fraction form
   2,350.55/3,243.80 = 1,288.25/x
3. Step 3: Cross multiply
   2,350.55x = 3,243.80 × 1,288.25
4. Step 4: Simplify right side
   2,350.55x = 4,178,815.39
5. Step 5: Solve for x
   x = 4,178,815.39/2,350.55
6. Step 6: Final answer
   x = 1,777.80