Finding the Fourth Proportional to 1,007.17, 1,510.83 and 357.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.17 : 1,510.83 = 357.91 : x
2. Step 2: Convert to fraction form
   1,007.17/1,510.83 = 357.91/x
3. Step 3: Cross multiply
   1,007.17x = 1,510.83 × 357.91
4. Step 4: Simplify right side
   1,007.17x = 540,741.17
5. Step 5: Solve for x
   x = 540,741.17/1,007.17
6. Step 6: Final answer
   x = 536.89