Finding the Fourth Proportional to 1,427.06, 2,139.10 and 697.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.06 : 2,139.10 = 697.12 : x
2. Step 2: Convert to fraction form
   1,427.06/2,139.10 = 697.12/x
3. Step 3: Cross multiply
   1,427.06x = 2,139.10 × 697.12
4. Step 4: Simplify right side
   1,427.06x = 1,491,209.39
5. Step 5: Solve for x
   x = 1,491,209.39/1,427.06
6. Step 6: Final answer
   x = 1,044.95