Finding the Fourth Proportional to 31,125.84, 42,953.78 and 16,978.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,125.84 : 42,953.78 = 16,978.98 : x
2. Step 2: Convert to fraction form
   31,125.84/42,953.78 = 16,978.98/x
3. Step 3: Cross multiply
   31,125.84x = 42,953.78 × 16,978.98
4. Step 4: Simplify right side
   31,125.84x = 729,311,371.54
5. Step 5: Solve for x
   x = 729,311,371.54/31,125.84
6. Step 6: Final answer
   x = 23,431.06