Finding the Fourth Proportional to 1,914.07, 2,640.71 and 1,205.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,914.07 : 2,640.71 = 1,205.72 : x
2. Step 2: Convert to fraction form
   1,914.07/2,640.71 = 1,205.72/x
3. Step 3: Cross multiply
   1,914.07x = 2,640.71 × 1,205.72
4. Step 4: Simplify right side
   1,914.07x = 3,183,950.83
5. Step 5: Solve for x
   x = 3,183,950.83/1,914.07
6. Step 6: Final answer
   x = 1,663.45