Finding the Fourth Proportional to 1,215.34, 1,673.40 and 1,018.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.34 : 1,673.40 = 1,018.42 : x
2. Step 2: Convert to fraction form
   1,215.34/1,673.40 = 1,018.42/x
3. Step 3: Cross multiply
   1,215.34x = 1,673.40 × 1,018.42
4. Step 4: Simplify right side
   1,215.34x = 1,704,224.03
5. Step 5: Solve for x
   x = 1,704,224.03/1,215.34
6. Step 6: Final answer
   x = 1,402.26