Finding the Fourth Proportional to 31,109.22, 42,931.17 and 16,962.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.22 : 42,931.17 = 16,962.78 : x
2. Step 2: Convert to fraction form
   31,109.22/42,931.17 = 16,962.78/x
3. Step 3: Cross multiply
   31,109.22x = 42,931.17 × 16,962.78
4. Step 4: Simplify right side
   31,109.22x = 728,231,991.85
5. Step 5: Solve for x
   x = 728,231,991.85/31,109.22
6. Step 6: Final answer
   x = 23,408.88