Finding the Fourth Proportional to 736.72, 1,016.71 and 421.99

Step by Step Solution

1. Step 1: Write the proportion equation
   736.72 : 1,016.71 = 421.99 : x
2. Step 2: Convert to fraction form
   736.72/1,016.71 = 421.99/x
3. Step 3: Cross multiply
   736.72x = 1,016.71 × 421.99
4. Step 4: Simplify right side
   736.72x = 429,041.45
5. Step 5: Solve for x
   x = 429,041.45/736.72
6. Step 6: Final answer
   x = 582.37