Finding the Fourth Proportional to 1,987.30, 2,742.61 and 1,201.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.30 : 2,742.61 = 1,201.38 : x
2. Step 2: Convert to fraction form
   1,987.30/2,742.61 = 1,201.38/x
3. Step 3: Cross multiply
   1,987.30x = 2,742.61 × 1,201.38
4. Step 4: Simplify right side
   1,987.30x = 3,294,916.80
5. Step 5: Solve for x
   x = 3,294,916.80/1,987.30
6. Step 6: Final answer
   x = 1,657.99