Finding the Fourth Proportional to 1,993.58, 2,987.77 and 1,242.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,993.58 : 2,987.77 = 1,242.78 : x
2. Step 2: Convert to fraction form
   1,993.58/2,987.77 = 1,242.78/x
3. Step 3: Cross multiply
   1,993.58x = 2,987.77 × 1,242.78
4. Step 4: Simplify right side
   1,993.58x = 3,713,127.12
5. Step 5: Solve for x
   x = 3,713,127.12/1,993.58
6. Step 6: Final answer
   x = 1,862.54