Finding the Fourth Proportional to 1,386.31, 2,081.63 and 738.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.31 : 2,081.63 = 738.31 : x
2. Step 2: Convert to fraction form
   1,386.31/2,081.63 = 738.31/x
3. Step 3: Cross multiply
   1,386.31x = 2,081.63 × 738.31
4. Step 4: Simplify right side
   1,386.31x = 1,536,888.25
5. Step 5: Solve for x
   x = 1,536,888.25/1,386.31
6. Step 6: Final answer
   x = 1,108.62