Finding the Fourth Proportional to 1,989.42, 2,744.73 and 1,290.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,989.42 : 2,744.73 = 1,290.93 : x
2. Step 2: Convert to fraction form
   1,989.42/2,744.73 = 1,290.93/x
3. Step 3: Cross multiply
   1,989.42x = 2,744.73 × 1,290.93
4. Step 4: Simplify right side
   1,989.42x = 3,543,254.30
5. Step 5: Solve for x
   x = 3,543,254.30/1,989.42
6. Step 6: Final answer
   x = 1,781.05