Finding the Fourth Proportional to 1,421.74, 1,962.66 and 1,002.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.74 : 1,962.66 = 1,002.43 : x
2. Step 2: Convert to fraction form
   1,421.74/1,962.66 = 1,002.43/x
3. Step 3: Cross multiply
   1,421.74x = 1,962.66 × 1,002.43
4. Step 4: Simplify right side
   1,421.74x = 1,967,429.26
5. Step 5: Solve for x
   x = 1,967,429.26/1,421.74
6. Step 6: Final answer
   x = 1,383.82