Finding the Fourth Proportional to 1,109.03, 1,662.12 and 415.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.03 : 1,662.12 = 415.06 : x
2. Step 2: Convert to fraction form
   1,109.03/1,662.12 = 415.06/x
3. Step 3: Cross multiply
   1,109.03x = 1,662.12 × 415.06
4. Step 4: Simplify right side
   1,109.03x = 689,875.37
5. Step 5: Solve for x
   x = 689,875.37/1,109.03
6. Step 6: Final answer
   x = 622.06