Finding the Fourth Proportional to 948.42, 1,422.72 and 315.18

Step by Step Solution

1. Step 1: Write the proportion equation
   948.42 : 1,422.72 = 315.18 : x
2. Step 2: Convert to fraction form
   948.42/1,422.72 = 315.18/x
3. Step 3: Cross multiply
   948.42x = 1,422.72 × 315.18
4. Step 4: Simplify right side
   948.42x = 448,412.89
5. Step 5: Solve for x
   x = 448,412.89/948.42
6. Step 6: Final answer
   x = 472.80