Finding the Fourth Proportional to 1,061.28, 1,591.77 and 513.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.28 : 1,591.77 = 513.32 : x
2. Step 2: Convert to fraction form
   1,061.28/1,591.77 = 513.32/x
3. Step 3: Cross multiply
   1,061.28x = 1,591.77 × 513.32
4. Step 4: Simplify right side
   1,061.28x = 817,079.42
5. Step 5: Solve for x
   x = 817,079.42/1,061.28
6. Step 6: Final answer
   x = 769.90