Finding the Fourth Proportional to 1,004.81, 1,507.28 and 518.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,004.81 : 1,507.28 = 518.00 : x
2. Step 2: Convert to fraction form
   1,004.81/1,507.28 = 518.00/x
3. Step 3: Cross multiply
   1,004.81x = 1,507.28 × 518.00
4. Step 4: Simplify right side
   1,004.81x = 780,760.91
5. Step 5: Solve for x
   x = 780,760.91/1,004.81
6. Step 6: Final answer
   x = 777.03