Finding the Fourth Proportional to 754.31, 1,131.91 and 315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   754.31 : 1,131.91 = 315.50 : x
2. Step 2: Convert to fraction form
   754.31/1,131.91 = 315.50/x
3. Step 3: Cross multiply
   754.31x = 1,131.91 × 315.50
4. Step 4: Simplify right side
   754.31x = 357,111.16
5. Step 5: Solve for x
   x = 357,111.16/754.31
6. Step 6: Final answer
   x = 473.43