Finding the Fourth Proportional to 42,983.40, 64,498.64 and 16,689.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,983.40 : 64,498.64 = 16,689.18 : x
2. Step 2: Convert to fraction form
   42,983.40/64,498.64 = 16,689.18/x
3. Step 3: Cross multiply
   42,983.40x = 64,498.64 × 16,689.18
4. Step 4: Simplify right side
   42,983.40x = 1,076,429,329.27
5. Step 5: Solve for x
   x = 1,076,429,329.27/42,983.40
6. Step 6: Final answer
   x = 25,042.91