Finding the Fourth Proportional to 1,196.61, 1,793.83 and 426.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.61 : 1,793.83 = 426.93 : x
2. Step 2: Convert to fraction form
   1,196.61/1,793.83 = 426.93/x
3. Step 3: Cross multiply
   1,196.61x = 1,793.83 × 426.93
4. Step 4: Simplify right side
   1,196.61x = 765,828.74
5. Step 5: Solve for x
   x = 765,828.74/1,196.61
6. Step 6: Final answer
   x = 640.00