Finding the Fourth Proportional to 2,139.28, 3,209.45 and 1,262.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.28 : 3,209.45 = 1,262.50 : x
2. Step 2: Convert to fraction form
   2,139.28/3,209.45 = 1,262.50/x
3. Step 3: Cross multiply
   2,139.28x = 3,209.45 × 1,262.50
4. Step 4: Simplify right side
   2,139.28x = 4,051,916.29
5. Step 5: Solve for x
   x = 4,051,916.29/2,139.28
6. Step 6: Final answer
   x = 1,894.06