Finding the Fourth Proportional to 2,201.60, 3,300 and 902.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,201.60 : 3,300 = 902.72 : x
2. Step 2: Convert to fraction form
   2,201.60/3,300 = 902.72/x
3. Step 3: Cross multiply
   2,201.60x = 3,300 × 902.72
4. Step 4: Simplify right side
   2,201.60x = 2,978,976
5. Step 5: Solve for x
   x = 2,978,976/2,201.60
6. Step 6: Final answer
   x = 1,353.10