Finding the Fourth Proportional to 1,007.05, 1,510.86 and 357.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.05 : 1,510.86 = 357.85 : x
2. Step 2: Convert to fraction form
   1,007.05/1,510.86 = 357.85/x
3. Step 3: Cross multiply
   1,007.05x = 1,510.86 × 357.85
4. Step 4: Simplify right side
   1,007.05x = 540,661.25
5. Step 5: Solve for x
   x = 540,661.25/1,007.05
6. Step 6: Final answer
   x = 536.88