Finding the Fourth Proportional to 31,132.80, 42,962.94 and 16,985.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,132.80 : 42,962.94 = 16,985.34 : x
2. Step 2: Convert to fraction form
   31,132.80/42,962.94 = 16,985.34/x
3. Step 3: Cross multiply
   31,132.80x = 42,962.94 × 16,985.34
4. Step 4: Simplify right side
   31,132.80x = 729,740,143.30
5. Step 5: Solve for x
   x = 729,740,143.30/31,132.80
6. Step 6: Final answer
   x = 23,439.59