Finding the Fourth Proportional to 1,019.48, 1,528.26 and 608.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.48 : 1,528.26 = 608.72 : x
2. Step 2: Convert to fraction form
   1,019.48/1,528.26 = 608.72/x
3. Step 3: Cross multiply
   1,019.48x = 1,528.26 × 608.72
4. Step 4: Simplify right side
   1,019.48x = 930,282.43
5. Step 5: Solve for x
   x = 930,282.43/1,019.48
6. Step 6: Final answer
   x = 912.51