Finding the Fourth Proportional to 1,012.20, 1,517.94 and 434.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.20 : 1,517.94 = 434.76 : x
2. Step 2: Convert to fraction form
   1,012.20/1,517.94 = 434.76/x
3. Step 3: Cross multiply
   1,012.20x = 1,517.94 × 434.76
4. Step 4: Simplify right side
   1,012.20x = 659,939.59
5. Step 5: Solve for x
   x = 659,939.59/1,012.20
6. Step 6: Final answer
   x = 651.99