Finding the Fourth Proportional to 1,645.18, 2,268.27 and 1,054.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.18 : 2,268.27 = 1,054.72 : x
2. Step 2: Convert to fraction form
   1,645.18/2,268.27 = 1,054.72/x
3. Step 3: Cross multiply
   1,645.18x = 2,268.27 × 1,054.72
4. Step 4: Simplify right side
   1,645.18x = 2,392,389.73
5. Step 5: Solve for x
   x = 2,392,389.73/1,645.18
6. Step 6: Final answer
   x = 1,454.18