Finding the Fourth Proportional to 1,281.90, 1,767.42 and 1,072.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.90 : 1,767.42 = 1,072.38 : x
2. Step 2: Convert to fraction form
   1,281.90/1,767.42 = 1,072.38/x
3. Step 3: Cross multiply
   1,281.90x = 1,767.42 × 1,072.38
4. Step 4: Simplify right side
   1,281.90x = 1,895,345.86
5. Step 5: Solve for x
   x = 1,895,345.86/1,281.90
6. Step 6: Final answer
   x = 1,478.54