Finding the Fourth Proportional to 2,774.53, 3,823.59 and 1,987.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,774.53 : 3,823.59 = 1,987.21 : x
2. Step 2: Convert to fraction form
   2,774.53/3,823.59 = 1,987.21/x
3. Step 3: Cross multiply
   2,774.53x = 3,823.59 × 1,987.21
4. Step 4: Simplify right side
   2,774.53x = 7,598,276.28
5. Step 5: Solve for x
   x = 7,598,276.28/2,774.53
6. Step 6: Final answer
   x = 2,738.58