Finding the Fourth Proportional to 1,308.74, 1,962.54 and 518.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.74 : 1,962.54 = 518.00 : x
2. Step 2: Convert to fraction form
   1,308.74/1,962.54 = 518.00/x
3. Step 3: Cross multiply
   1,308.74x = 1,962.54 × 518.00
4. Step 4: Simplify right side
   1,308.74x = 1,016,585.91
5. Step 5: Solve for x
   x = 1,016,585.91/1,308.74
6. Step 6: Final answer
   x = 776.77