Finding the Fourth Proportional to 31,132.82, 42,962.72 and 16,985.64

Step by Step Solution

1. Step 1: Write the proportion equation
   31,132.82 : 42,962.72 = 16,985.64 : x
2. Step 2: Convert to fraction form
   31,132.82/42,962.72 = 16,985.64/x
3. Step 3: Cross multiply
   31,132.82x = 42,962.72 × 16,985.64
4. Step 4: Simplify right side
   31,132.82x = 729,749,295.34
5. Step 5: Solve for x
   x = 729,749,295.34/31,132.82
6. Step 6: Final answer
   x = 23,439.87