Finding the Fourth Proportional to 1,386.73, 2,084.55 and 1,115.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.73 : 2,084.55 = 1,115.83 : x
2. Step 2: Convert to fraction form
   1,386.73/2,084.55 = 1,115.83/x
3. Step 3: Cross multiply
   1,386.73x = 2,084.55 × 1,115.83
4. Step 4: Simplify right side
   1,386.73x = 2,326,003.43
5. Step 5: Solve for x
   x = 2,326,003.43/1,386.73
6. Step 6: Final answer
   x = 1,677.33