Finding the Fourth Proportional to 2,020.50, 2,788.29 and 1,399.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.50 : 2,788.29 = 1,399.86 : x
2. Step 2: Convert to fraction form
   2,020.50/2,788.29 = 1,399.86/x
3. Step 3: Cross multiply
   2,020.50x = 2,788.29 × 1,399.86
4. Step 4: Simplify right side
   2,020.50x = 3,903,215.64
5. Step 5: Solve for x
   x = 3,903,215.64/2,020.50
6. Step 6: Final answer
   x = 1,931.81