Finding the Fourth Proportional to 1,215.72, 1,823.31 and 350.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.72 : 1,823.31 = 350.10 : x
2. Step 2: Convert to fraction form
   1,215.72/1,823.31 = 350.10/x
3. Step 3: Cross multiply
   1,215.72x = 1,823.31 × 350.10
4. Step 4: Simplify right side
   1,215.72x = 638,340.83
5. Step 5: Solve for x
   x = 638,340.83/1,215.72
6. Step 6: Final answer
   x = 525.07