Finding the Fourth Proportional to 1,425.11, 1,966.73 and 1,005.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.11 : 1,966.73 = 1,005.59 : x
2. Step 2: Convert to fraction form
   1,425.11/1,966.73 = 1,005.59/x
3. Step 3: Cross multiply
   1,425.11x = 1,966.73 × 1,005.59
4. Step 4: Simplify right side
   1,425.11x = 1,977,723.91
5. Step 5: Solve for x
   x = 1,977,723.91/1,425.11
6. Step 6: Final answer
   x = 1,387.77