Finding the Fourth Proportional to 1,111.27, 1,666.98 and 417.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.27 : 1,666.98 = 417.96 : x
2. Step 2: Convert to fraction form
   1,111.27/1,666.98 = 417.96/x
3. Step 3: Cross multiply
   1,111.27x = 1,666.98 × 417.96
4. Step 4: Simplify right side
   1,111.27x = 696,730.96
5. Step 5: Solve for x
   x = 696,730.96/1,111.27
6. Step 6: Final answer
   x = 626.97