Finding the Fourth Proportional to 31,078.58, 42,888.20 and 16,931.39

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.58 : 42,888.20 = 16,931.39 : x
2. Step 2: Convert to fraction form
   31,078.58/42,888.20 = 16,931.39/x
3. Step 3: Cross multiply
   31,078.58x = 42,888.20 × 16,931.39
4. Step 4: Simplify right side
   31,078.58x = 726,156,541.50
5. Step 5: Solve for x
   x = 726,156,541.50/31,078.58
6. Step 6: Final answer
   x = 23,365.18