Finding the Fourth Proportional to 2,268.84, 3,131.34 and 1,385.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,268.84 : 3,131.34 = 1,385.15 : x
2. Step 2: Convert to fraction form
   2,268.84/3,131.34 = 1,385.15/x
3. Step 3: Cross multiply
   2,268.84x = 3,131.34 × 1,385.15
4. Step 4: Simplify right side
   2,268.84x = 4,337,375.60
5. Step 5: Solve for x
   x = 4,337,375.60/2,268.84
6. Step 6: Final answer
   x = 1,911.72