Finding the Fourth Proportional to 31,112.64, 42,957.54 and 19,179.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.64 : 42,957.54 = 19,179.72 : x
2. Step 2: Convert to fraction form
   31,112.64/42,957.54 = 19,179.72/x
3. Step 3: Cross multiply
   31,112.64x = 42,957.54 × 19,179.72
4. Step 4: Simplify right side
   31,112.64x = 823,913,589.09
5. Step 5: Solve for x
   x = 823,913,589.09/31,112.64
6. Step 6: Final answer
   x = 26,481.64