Finding the Fourth Proportional to 1,019.43, 1,528.23 and 402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.43 : 1,528.23 = 402.72 : x
2. Step 2: Convert to fraction form
   1,019.43/1,528.23 = 402.72/x
3. Step 3: Cross multiply
   1,019.43x = 1,528.23 × 402.72
4. Step 4: Simplify right side
   1,019.43x = 615,448.79
5. Step 5: Solve for x
   x = 615,448.79/1,019.43
6. Step 6: Final answer
   x = 603.72