Finding the Fourth Proportional to 31,068.81, 42,875.01 and 16,921.35

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.81 : 42,875.01 = 16,921.35 : x
2. Step 2: Convert to fraction form
   31,068.81/42,875.01 = 16,921.35/x
3. Step 3: Cross multiply
   31,068.81x = 42,875.01 × 16,921.35
4. Step 4: Simplify right side
   31,068.81x = 725,503,050.46
5. Step 5: Solve for x
   x = 725,503,050.46/31,068.81
6. Step 6: Final answer
   x = 23,351.49