Finding the Fourth Proportional to 948.72, 1,421.52 and 912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   948.72 : 1,421.52 = 912.72 : x
2. Step 2: Convert to fraction form
   948.72/1,421.52 = 912.72/x
3. Step 3: Cross multiply
   948.72x = 1,421.52 × 912.72
4. Step 4: Simplify right side
   948.72x = 1,297,449.73
5. Step 5: Solve for x
   x = 1,297,449.73/948.72
6. Step 6: Final answer
   x = 1,367.58