Finding the Fourth Proportional to 1,116.61, 1,673.61 and 422.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.61 : 1,673.61 = 422.83 : x
2. Step 2: Convert to fraction form
   1,116.61/1,673.61 = 422.83/x
3. Step 3: Cross multiply
   1,116.61x = 1,673.61 × 422.83
4. Step 4: Simplify right side
   1,116.61x = 707,652.52
5. Step 5: Solve for x
   x = 707,652.52/1,116.61
6. Step 6: Final answer
   x = 633.75