Finding the Fourth Proportional to 1,987.11, 2,742.71 and 1,429.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.11 : 2,742.71 = 1,429.25 : x
2. Step 2: Convert to fraction form
   1,987.11/2,742.71 = 1,429.25/x
3. Step 3: Cross multiply
   1,987.11x = 2,742.71 × 1,429.25
4. Step 4: Simplify right side
   1,987.11x = 3,919,997.41
5. Step 5: Solve for x
   x = 3,919,997.41/1,987.11
6. Step 6: Final answer
   x = 1,972.71