Finding the Fourth Proportional to 1,402.34, 2,100.31 and 672.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.34 : 2,100.31 = 672.43 : x
2. Step 2: Convert to fraction form
   1,402.34/2,100.31 = 672.43/x
3. Step 3: Cross multiply
   1,402.34x = 2,100.31 × 672.43
4. Step 4: Simplify right side
   1,402.34x = 1,412,311.45
5. Step 5: Solve for x
   x = 1,412,311.45/1,402.34
6. Step 6: Final answer
   x = 1,007.11