Finding the Fourth Proportional to 31,111.76, 42,934.20 and 16,965.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,111.76 : 42,934.20 = 16,965.56 : x
2. Step 2: Convert to fraction form
   31,111.76/42,934.20 = 16,965.56/x
3. Step 3: Cross multiply
   31,111.76x = 42,934.20 × 16,965.56
4. Step 4: Simplify right side
   31,111.76x = 728,402,746.15
5. Step 5: Solve for x
   x = 728,402,746.15/31,111.76
6. Step 6: Final answer
   x = 23,412.46