Finding the Fourth Proportional to 2,269.86, 3,131.67 and 1,386.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,269.86 : 3,131.67 = 1,386.06 : x
2. Step 2: Convert to fraction form
   2,269.86/3,131.67 = 1,386.06/x
3. Step 3: Cross multiply
   2,269.86x = 3,131.67 × 1,386.06
4. Step 4: Simplify right side
   2,269.86x = 4,340,682.52
5. Step 5: Solve for x
   x = 4,340,682.52/2,269.86
6. Step 6: Final answer
   x = 1,912.31