Finding the Fourth Proportional to 31,109.28, 42,929.72 and 16,961.84

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.28 : 42,929.72 = 16,961.84 : x
2. Step 2: Convert to fraction form
   31,109.28/42,929.72 = 16,961.84/x
3. Step 3: Cross multiply
   31,109.28x = 42,929.72 × 16,961.84
4. Step 4: Simplify right side
   31,109.28x = 728,167,041.88
5. Step 5: Solve for x
   x = 728,167,041.88/31,109.28
6. Step 6: Final answer
   x = 23,406.75