Finding the Fourth Proportional to 3,469.30, 4,787.31 and 1,977.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,469.30 : 4,787.31 = 1,977.55 : x
2. Step 2: Convert to fraction form
   3,469.30/4,787.31 = 1,977.55/x
3. Step 3: Cross multiply
   3,469.30x = 4,787.31 × 1,977.55
4. Step 4: Simplify right side
   3,469.30x = 9,467,144.89
5. Step 5: Solve for x
   x = 9,467,144.89/3,469.30
6. Step 6: Final answer
   x = 2,728.83