Finding the Fourth Proportional to 1,425.80, 1,966.48 and 1,159.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.80 : 1,966.48 = 1,159.72 : x
2. Step 2: Convert to fraction form
   1,425.80/1,966.48 = 1,159.72/x
3. Step 3: Cross multiply
   1,425.80x = 1,966.48 × 1,159.72
4. Step 4: Simplify right side
   1,425.80x = 2,280,558.37
5. Step 5: Solve for x
   x = 2,280,558.37/1,425.80
6. Step 6: Final answer
   x = 1,599.49