Finding the Fourth Proportional to 2,091.45, 3,131.10 and 1,269.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.45 : 3,131.10 = 1,269.30 : x
2. Step 2: Convert to fraction form
   2,091.45/3,131.10 = 1,269.30/x
3. Step 3: Cross multiply
   2,091.45x = 3,131.10 × 1,269.30
4. Step 4: Simplify right side
   2,091.45x = 3,974,305.23
5. Step 5: Solve for x
   x = 3,974,305.23/2,091.45
6. Step 6: Final answer
   x = 1,900.26