Finding the Fourth Proportional to 1,386.38, 2,079.59 and 773.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.38 : 2,079.59 = 773.98 : x
2. Step 2: Convert to fraction form
   1,386.38/2,079.59 = 773.98/x
3. Step 3: Cross multiply
   1,386.38x = 2,079.59 × 773.98
4. Step 4: Simplify right side
   1,386.38x = 1,609,546.80
5. Step 5: Solve for x
   x = 1,609,546.80/1,386.38
6. Step 6: Final answer
   x = 1,160.97