Finding the Fourth Proportional to 1,111.03, 1,665.12 and 417.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.03 : 1,665.12 = 417.06 : x
2. Step 2: Convert to fraction form
   1,111.03/1,665.12 = 417.06/x
3. Step 3: Cross multiply
   1,111.03x = 1,665.12 × 417.06
4. Step 4: Simplify right side
   1,111.03x = 694,454.95
5. Step 5: Solve for x
   x = 694,454.95/1,111.03
6. Step 6: Final answer
   x = 625.06