Finding the Fourth Proportional to 1,066.38, 1,600.79 and 715.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.38 : 1,600.79 = 715.25 : x
2. Step 2: Convert to fraction form
   1,066.38/1,600.79 = 715.25/x
3. Step 3: Cross multiply
   1,066.38x = 1,600.79 × 715.25
4. Step 4: Simplify right side
   1,066.38x = 1,144,953.47
5. Step 5: Solve for x
   x = 1,144,953.47/1,066.38
6. Step 6: Final answer
   x = 1,073.68