Finding the Fourth Proportional to 1,621.74, 2,429.82 and 1,277.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.74 : 2,429.82 = 1,277.28 : x
2. Step 2: Convert to fraction form
   1,621.74/2,429.82 = 1,277.28/x
3. Step 3: Cross multiply
   1,621.74x = 2,429.82 × 1,277.28
4. Step 4: Simplify right side
   1,621.74x = 3,103,560.49
5. Step 5: Solve for x
   x = 3,103,560.49/1,621.74
6. Step 6: Final answer
   x = 1,913.72