Finding the Fourth Proportional to 1,987.71, 2,742.59 and 1,201.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.71 : 2,742.59 = 1,201.74 : x
2. Step 2: Convert to fraction form
   1,987.71/2,742.59 = 1,201.74/x
3. Step 3: Cross multiply
   1,987.71x = 2,742.59 × 1,201.74
4. Step 4: Simplify right side
   1,987.71x = 3,295,872.83
5. Step 5: Solve for x
   x = 3,295,872.83/1,987.71
6. Step 6: Final answer
   x = 1,658.13