Finding the Fourth Proportional to 2,518.55, 3,475.76 and 1,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.55 : 3,475.76 = 1,399.50 : x
2. Step 2: Convert to fraction form
   2,518.55/3,475.76 = 1,399.50/x
3. Step 3: Cross multiply
   2,518.55x = 3,475.76 × 1,399.50
4. Step 4: Simplify right side
   2,518.55x = 4,864,326.12
5. Step 5: Solve for x
   x = 4,864,326.12/2,518.55
6. Step 6: Final answer
   x = 1,931.40