Finding the Fourth Proportional to 1,854.51, 2,778.61 and 1,620.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,854.51 : 2,778.61 = 1,620.83 : x
2. Step 2: Convert to fraction form
   1,854.51/2,778.61 = 1,620.83/x
3. Step 3: Cross multiply
   1,854.51x = 2,778.61 × 1,620.83
4. Step 4: Simplify right side
   1,854.51x = 4,503,654.45
5. Step 5: Solve for x
   x = 4,503,654.45/1,854.51
6. Step 6: Final answer
   x = 2,428.49