Finding the Fourth Proportional to 1,116.50, 1,673.56 and 422.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.50 : 1,673.56 = 422.86 : x
2. Step 2: Convert to fraction form
   1,116.50/1,673.56 = 422.86/x
3. Step 3: Cross multiply
   1,116.50x = 1,673.56 × 422.86
4. Step 4: Simplify right side
   1,116.50x = 707,681.58
5. Step 5: Solve for x
   x = 707,681.58/1,116.50
6. Step 6: Final answer
   x = 633.84