Finding the Fourth Proportional to 2,118.52, 2,923.52 and 1,187.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.52 : 2,923.52 = 1,187.20 : x
2. Step 2: Convert to fraction form
   2,118.52/2,923.52 = 1,187.20/x
3. Step 3: Cross multiply
   2,118.52x = 2,923.52 × 1,187.20
4. Step 4: Simplify right side
   2,118.52x = 3,470,802.94
5. Step 5: Solve for x
   x = 3,470,802.94/2,118.52
6. Step 6: Final answer
   x = 1,638.31