Finding the Fourth Proportional to 2,269.50, 3,131.91 and 1,385.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,269.50 : 3,131.91 = 1,385.16 : x
2. Step 2: Convert to fraction form
   2,269.50/3,131.91 = 1,385.16/x
3. Step 3: Cross multiply
   2,269.50x = 3,131.91 × 1,385.16
4. Step 4: Simplify right side
   2,269.50x = 4,338,196.46
5. Step 5: Solve for x
   x = 4,338,196.46/2,269.50
6. Step 6: Final answer
   x = 1,911.52