Finding the Fourth Proportional to 1,389.91, 2,083.48 and 773.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.91 : 2,083.48 = 773.89 : x
2. Step 2: Convert to fraction form
   1,389.91/2,083.48 = 773.89/x
3. Step 3: Cross multiply
   1,389.91x = 2,083.48 × 773.89
4. Step 4: Simplify right side
   1,389.91x = 1,612,384.34
5. Step 5: Solve for x
   x = 1,612,384.34/1,389.91
6. Step 6: Final answer
   x = 1,160.06