Finding the Fourth Proportional to 1,425.84, 2,139.12 and 1,270.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.84 : 2,139.12 = 1,270.72 : x
2. Step 2: Convert to fraction form
   1,425.84/2,139.12 = 1,270.72/x
3. Step 3: Cross multiply
   1,425.84x = 2,139.12 × 1,270.72
4. Step 4: Simplify right side
   1,425.84x = 2,718,222.57
5. Step 5: Solve for x
   x = 2,718,222.57/1,425.84
6. Step 6: Final answer
   x = 1,906.40