Finding the Fourth Proportional to 1,386.89, 2,082.15 and 1,272.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.89 : 2,082.15 = 1,272.27 : x
2. Step 2: Convert to fraction form
   1,386.89/2,082.15 = 1,272.27/x
3. Step 3: Cross multiply
   1,386.89x = 2,082.15 × 1,272.27
4. Step 4: Simplify right side
   1,386.89x = 2,649,056.98
5. Step 5: Solve for x
   x = 2,649,056.98/1,386.89
6. Step 6: Final answer
   x = 1,910.08