Finding the Fourth Proportional to 2,116.23, 2,920.28 and 1,277.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.23 : 2,920.28 = 1,277.21 : x
2. Step 2: Convert to fraction form
   2,116.23/2,920.28 = 1,277.21/x
3. Step 3: Cross multiply
   2,116.23x = 2,920.28 × 1,277.21
4. Step 4: Simplify right side
   2,116.23x = 3,729,789.83
5. Step 5: Solve for x
   x = 3,729,789.83/2,116.23
6. Step 6: Final answer
   x = 1,762.47