Finding the Fourth Proportional to 1,780.62, 2,455.92 and 1,485.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.62 : 2,455.92 = 1,485.42 : x
2. Step 2: Convert to fraction form
   1,780.62/2,455.92 = 1,485.42/x
3. Step 3: Cross multiply
   1,780.62x = 2,455.92 × 1,485.42
4. Step 4: Simplify right side
   1,780.62x = 3,648,072.69
5. Step 5: Solve for x
   x = 3,648,072.69/1,780.62
6. Step 6: Final answer
   x = 2,048.77