Finding the Fourth Proportional to 31,117.41, 42,941.75 and 16,970.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,117.41 : 42,941.75 = 16,970.31 : x
2. Step 2: Convert to fraction form
   31,117.41/42,941.75 = 16,970.31/x
3. Step 3: Cross multiply
   31,117.41x = 42,941.75 × 16,970.31
4. Step 4: Simplify right side
   31,117.41x = 728,734,724.59
5. Step 5: Solve for x
   x = 728,734,724.59/31,117.41
6. Step 6: Final answer
   x = 23,418.87