Finding the Fourth Proportional to 2,118.72, 2,923.56 and 1,187.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.72 : 2,923.56 = 1,187.22 : x
2. Step 2: Convert to fraction form
   2,118.72/2,923.56 = 1,187.22/x
3. Step 3: Cross multiply
   2,118.72x = 2,923.56 × 1,187.22
4. Step 4: Simplify right side
   2,118.72x = 3,470,908.90
5. Step 5: Solve for x
   x = 3,470,908.90/2,118.72
6. Step 6: Final answer
   x = 1,638.21