Finding the Fourth Proportional to 1,987.38, 2,742.03 and 1,242.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.38 : 2,742.03 = 1,242.10 : x
2. Step 2: Convert to fraction form
   1,987.38/2,742.03 = 1,242.10/x
3. Step 3: Cross multiply
   1,987.38x = 2,742.03 × 1,242.10
4. Step 4: Simplify right side
   1,987.38x = 3,405,868.61
5. Step 5: Solve for x
   x = 3,405,868.61/1,987.38
6. Step 6: Final answer
   x = 1,713.75