Finding the Fourth Proportional to 2,185.76, 2,999.38 and 1,987.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.76 : 2,999.38 = 1,987.76 : x
2. Step 2: Convert to fraction form
   2,185.76/2,999.38 = 1,987.76/x
3. Step 3: Cross multiply
   2,185.76x = 2,999.38 × 1,987.76
4. Step 4: Simplify right side
   2,185.76x = 5,962,047.59
5. Step 5: Solve for x
   x = 5,962,047.59/2,185.76
6. Step 6: Final answer
   x = 2,727.68