Finding the Fourth Proportional to 22,973.21, 31,604.61 and 21,989.06

Step by Step Solution

1. Step 1: Write the proportion equation
   22,973.21 : 31,604.61 = 21,989.06 : x
2. Step 2: Convert to fraction form
   22,973.21/31,604.61 = 21,989.06/x
3. Step 3: Cross multiply
   22,973.21x = 31,604.61 × 21,989.06
4. Step 4: Simplify right side
   22,973.21x = 694,955,665.57
5. Step 5: Solve for x
   x = 694,955,665.57/22,973.21
6. Step 6: Final answer
   x = 30,250.70