Finding the Fourth Proportional to 2,222.40, 3,070.80 and 1,665.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,222.40 : 3,070.80 = 1,665.12 : x
2. Step 2: Convert to fraction form
   2,222.40/3,070.80 = 1,665.12/x
3. Step 3: Cross multiply
   2,222.40x = 3,070.80 × 1,665.12
4. Step 4: Simplify right side
   2,222.40x = 5,113,250.50
5. Step 5: Solve for x
   x = 5,113,250.50/2,222.40
6. Step 6: Final answer
   x = 2,300.78