Finding the Fourth Proportional to 42,997.50, 64,479.69 and 16,698.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,997.50 : 64,479.69 = 16,698.78 : x
2. Step 2: Convert to fraction form
   42,997.50/64,479.69 = 16,698.78/x
3. Step 3: Cross multiply
   42,997.50x = 64,479.69 × 16,698.78
4. Step 4: Simplify right side
   42,997.50x = 1,076,732,157.78
5. Step 5: Solve for x
   x = 1,076,732,157.78/42,997.50
6. Step 6: Final answer
   x = 25,041.74