Finding the Fourth Proportional to 31,074.72, 46,603.92 and 21,212.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,074.72 : 46,603.92 = 21,212.16 : x
2. Step 2: Convert to fraction form
   31,074.72/46,603.92 = 21,212.16/x
3. Step 3: Cross multiply
   31,074.72x = 46,603.92 × 21,212.16
4. Step 4: Simplify right side
   31,074.72x = 988,569,807.67
5. Step 5: Solve for x
   x = 988,569,807.67/31,074.72
6. Step 6: Final answer
   x = 31,812.67