Finding the Fourth Proportional to 31,036.79, 42,831.45 and 16,889.63

Step by Step Solution

1. Step 1: Write the proportion equation
   31,036.79 : 42,831.45 = 16,889.63 : x
2. Step 2: Convert to fraction form
   31,036.79/42,831.45 = 16,889.63/x
3. Step 3: Cross multiply
   31,036.79x = 42,831.45 × 16,889.63
4. Step 4: Simplify right side
   31,036.79x = 723,407,128.71
5. Step 5: Solve for x
   x = 723,407,128.71/31,036.79
6. Step 6: Final answer
   x = 23,308.05