Finding the Fourth Proportional to 2,549.72, 3,518.56 and 1,399.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,549.72 : 3,518.56 = 1,399.90 : x
2. Step 2: Convert to fraction form
   2,549.72/3,518.56 = 1,399.90/x
3. Step 3: Cross multiply
   2,549.72x = 3,518.56 × 1,399.90
4. Step 4: Simplify right side
   2,549.72x = 4,925,607.55
5. Step 5: Solve for x
   x = 4,925,607.55/2,549.72
6. Step 6: Final answer
   x = 1,931.83