Finding the Fourth Proportional to 2,211.78, 3,052.55 and 1,428.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.78 : 3,052.55 = 1,428.10 : x
2. Step 2: Convert to fraction form
   2,211.78/3,052.55 = 1,428.10/x
3. Step 3: Cross multiply
   2,211.78x = 3,052.55 × 1,428.10
4. Step 4: Simplify right side
   2,211.78x = 4,359,346.66
5. Step 5: Solve for x
   x = 4,359,346.66/2,211.78
6. Step 6: Final answer
   x = 1,970.97