Finding the Fourth Proportional to 3,111.18, 4,666.59 and 920.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.18 : 4,666.59 = 920.22 : x
2. Step 2: Convert to fraction form
   3,111.18/4,666.59 = 920.22/x
3. Step 3: Cross multiply
   3,111.18x = 4,666.59 × 920.22
4. Step 4: Simplify right side
   3,111.18x = 4,294,289.45
5. Step 5: Solve for x
   x = 4,294,289.45/3,111.18
6. Step 6: Final answer
   x = 1,380.28