Finding the Fourth Proportional to 1,196.10, 1,793.99 and 426.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.10 : 1,793.99 = 426.50 : x
2. Step 2: Convert to fraction form
   1,196.10/1,793.99 = 426.50/x
3. Step 3: Cross multiply
   1,196.10x = 1,793.99 × 426.50
4. Step 4: Simplify right side
   1,196.10x = 765,136.74
5. Step 5: Solve for x
   x = 765,136.74/1,196.10
6. Step 6: Final answer
   x = 639.69