Finding the Fourth Proportional to 1,019.72, 1,529.28 and 434.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.72 : 1,529.28 = 434.72 : x
2. Step 2: Convert to fraction form
   1,019.72/1,529.28 = 434.72/x
3. Step 3: Cross multiply
   1,019.72x = 1,529.28 × 434.72
4. Step 4: Simplify right side
   1,019.72x = 664,798.78
5. Step 5: Solve for x
   x = 664,798.78/1,019.72
6. Step 6: Final answer
   x = 651.94