Finding the Fourth Proportional to 1,389.43, 2,085.50 and 773.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.43 : 2,085.50 = 773.43 : x
2. Step 2: Convert to fraction form
   1,389.43/2,085.50 = 773.43/x
3. Step 3: Cross multiply
   1,389.43x = 2,085.50 × 773.43
4. Step 4: Simplify right side
   1,389.43x = 1,612,973.97
5. Step 5: Solve for x
   x = 1,612,973.97/1,389.43
6. Step 6: Final answer
   x = 1,160.89