Finding the Fourth Proportional to 31,118.63, 42,943.73 and 16,971.57

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.63 : 42,943.73 = 16,971.57 : x
2. Step 2: Convert to fraction form
   31,118.63/42,943.73 = 16,971.57/x
3. Step 3: Cross multiply
   31,118.63x = 42,943.73 × 16,971.57
4. Step 4: Simplify right side
   31,118.63x = 728,822,434.90
5. Step 5: Solve for x
   x = 728,822,434.90/31,118.63
6. Step 6: Final answer
   x = 23,420.78