Finding the Fourth Proportional to 1,816.38, 2,506.22 and 1,187.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,816.38 : 2,506.22 = 1,187.83 : x
2. Step 2: Convert to fraction form
   1,816.38/2,506.22 = 1,187.83/x
3. Step 3: Cross multiply
   1,816.38x = 2,506.22 × 1,187.83
4. Step 4: Simplify right side
   1,816.38x = 2,976,963.30
5. Step 5: Solve for x
   x = 2,976,963.30/1,816.38
6. Step 6: Final answer
   x = 1,638.95