Finding the Fourth Proportional to 1,284.73, 1,925.55 and 763.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,284.73 : 1,925.55 = 763.61 : x
2. Step 2: Convert to fraction form
   1,284.73/1,925.55 = 763.61/x
3. Step 3: Cross multiply
   1,284.73x = 1,925.55 × 763.61
4. Step 4: Simplify right side
   1,284.73x = 1,470,359.61
5. Step 5: Solve for x
   x = 1,470,359.61/1,284.73
6. Step 6: Final answer
   x = 1,144.49