Finding the Fourth Proportional to 1,041.34, 1,561.56 and 310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.34 : 1,561.56 = 310.72 : x
2. Step 2: Convert to fraction form
   1,041.34/1,561.56 = 310.72/x
3. Step 3: Cross multiply
   1,041.34x = 1,561.56 × 310.72
4. Step 4: Simplify right side
   1,041.34x = 485,207.92
5. Step 5: Solve for x
   x = 485,207.92/1,041.34
6. Step 6: Final answer
   x = 465.95