Finding the Fourth Proportional to 1,011.89, 1,517.56 and 434.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.89 : 1,517.56 = 434.63 : x
2. Step 2: Convert to fraction form
   1,011.89/1,517.56 = 434.63/x
3. Step 3: Cross multiply
   1,011.89x = 1,517.56 × 434.63
4. Step 4: Simplify right side
   1,011.89x = 659,577.10
5. Step 5: Solve for x
   x = 659,577.10/1,011.89
6. Step 6: Final answer
   x = 651.83