Finding the Fourth Proportional to 1,111.08, 1,665.48 and 417.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.08 : 1,665.48 = 417.62 : x
2. Step 2: Convert to fraction form
   1,111.08/1,665.48 = 417.62/x
3. Step 3: Cross multiply
   1,111.08x = 1,665.48 × 417.62
4. Step 4: Simplify right side
   1,111.08x = 695,537.76
5. Step 5: Solve for x
   x = 695,537.76/1,111.08
6. Step 6: Final answer
   x = 626.00