Finding the Fourth Proportional to 31,086.72, 46,621.44 and 21,223.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,086.72 : 46,621.44 = 21,223.68 : x
2. Step 2: Convert to fraction form
   31,086.72/46,621.44 = 21,223.68/x
3. Step 3: Cross multiply
   31,086.72x = 46,621.44 × 21,223.68
4. Step 4: Simplify right side
   31,086.72x = 989,478,523.70
5. Step 5: Solve for x
   x = 989,478,523.70/31,086.72
6. Step 6: Final answer
   x = 31,829.62