Finding the Fourth Proportional to 1,678.72, 2,518.56 and 524.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.72 : 2,518.56 = 524.56 : x
2. Step 2: Convert to fraction form
   1,678.72/2,518.56 = 524.56/x
3. Step 3: Cross multiply
   1,678.72x = 2,518.56 × 524.56
4. Step 4: Simplify right side
   1,678.72x = 1,321,135.83
5. Step 5: Solve for x
   x = 1,321,135.83/1,678.72
6. Step 6: Final answer
   x = 786.99