Finding the Fourth Proportional to 31,138.84, 42,971.72 and 16,992

Step by Step Solution

1. Step 1: Write the proportion equation
   31,138.84 : 42,971.72 = 16,992 : x
2. Step 2: Convert to fraction form
   31,138.84/42,971.72 = 16,992/x
3. Step 3: Cross multiply
   31,138.84x = 42,971.72 × 16,992
4. Step 4: Simplify right side
   31,138.84x = 730,175,466.24
5. Step 5: Solve for x
   x = 730,175,466.24/31,138.84
6. Step 6: Final answer
   x = 23,449.03