Finding the Fourth Proportional to 2,223.40, 3,072.18 and 1,666.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,223.40 : 3,072.18 = 1,666.12 : x
2. Step 2: Convert to fraction form
   2,223.40/3,072.18 = 1,666.12/x
3. Step 3: Cross multiply
   2,223.40x = 3,072.18 × 1,666.12
4. Step 4: Simplify right side
   2,223.40x = 5,118,620.54
5. Step 5: Solve for x
   x = 5,118,620.54/2,223.40
6. Step 6: Final answer
   x = 2,302.16