Finding the Fourth Proportional to 1,285.05, 1,925.39 and 698.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285.05 : 1,925.39 = 698.72 : x
2. Step 2: Convert to fraction form
   1,285.05/1,925.39 = 698.72/x
3. Step 3: Cross multiply
   1,285.05x = 1,925.39 × 698.72
4. Step 4: Simplify right side
   1,285.05x = 1,345,295.38
5. Step 5: Solve for x
   x = 1,345,295.38/1,285.05
6. Step 6: Final answer
   x = 1,046.88