Finding the Fourth Proportional to 1,383.66, 1,906.47 and 1,010.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.66 : 1,906.47 = 1,010.25 : x
2. Step 2: Convert to fraction form
   1,383.66/1,906.47 = 1,010.25/x
3. Step 3: Cross multiply
   1,383.66x = 1,906.47 × 1,010.25
4. Step 4: Simplify right side
   1,383.66x = 1,926,011.32
5. Step 5: Solve for x
   x = 1,926,011.32/1,383.66
6. Step 6: Final answer
   x = 1,391.97