Finding the Fourth Proportional to 31,118.64, 42,943.32 and 16,971.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.64 : 42,943.32 = 16,971.18 : x
2. Step 2: Convert to fraction form
   31,118.64/42,943.32 = 16,971.18/x
3. Step 3: Cross multiply
   31,118.64x = 42,943.32 × 16,971.18
4. Step 4: Simplify right side
   31,118.64x = 728,798,813.52
5. Step 5: Solve for x
   x = 728,798,813.52/31,118.64
6. Step 6: Final answer
   x = 23,420.01