Finding the Fourth Proportional to 1,061.28, 1,592.04 and 513.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.28 : 1,592.04 = 513.72 : x
2. Step 2: Convert to fraction form
   1,061.28/1,592.04 = 513.72/x
3. Step 3: Cross multiply
   1,061.28x = 1,592.04 × 513.72
4. Step 4: Simplify right side
   1,061.28x = 817,862.79
5. Step 5: Solve for x
   x = 817,862.79/1,061.28
6. Step 6: Final answer
   x = 770.64