Finding the Fourth Proportional to 999.42, 1,499.31 and 422.34

Step by Step Solution

1. Step 1: Write the proportion equation
   999.42 : 1,499.31 = 422.34 : x
2. Step 2: Convert to fraction form
   999.42/1,499.31 = 422.34/x
3. Step 3: Cross multiply
   999.42x = 1,499.31 × 422.34
4. Step 4: Simplify right side
   999.42x = 633,218.59
5. Step 5: Solve for x
   x = 633,218.59/999.42
6. Step 6: Final answer
   x = 633.59