Finding the Fourth Proportional to 2,221.78, 3,065.71 and 1,277.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.78 : 3,065.71 = 1,277.39 : x
2. Step 2: Convert to fraction form
   2,221.78/3,065.71 = 1,277.39/x
3. Step 3: Cross multiply
   2,221.78x = 3,065.71 × 1,277.39
4. Step 4: Simplify right side
   2,221.78x = 3,916,107.30
5. Step 5: Solve for x
   x = 3,916,107.30/2,221.78
6. Step 6: Final answer
   x = 1,762.60