Finding the Fourth Proportional to 1,987.63, 2,743.55 and 1,191.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.63 : 2,743.55 = 1,191.40 : x
2. Step 2: Convert to fraction form
   1,987.63/2,743.55 = 1,191.40/x
3. Step 3: Cross multiply
   1,987.63x = 2,743.55 × 1,191.40
4. Step 4: Simplify right side
   1,987.63x = 3,268,665.47
5. Step 5: Solve for x
   x = 3,268,665.47/1,987.63
6. Step 6: Final answer
   x = 1,644.50