Finding the Fourth Proportional to 42,991.59, 64,470.78 and 16,692.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,991.59 : 64,470.78 = 16,692.78 : x
2. Step 2: Convert to fraction form
   42,991.59/64,470.78 = 16,692.78/x
3. Step 3: Cross multiply
   42,991.59x = 64,470.78 × 16,692.78
4. Step 4: Simplify right side
   42,991.59x = 1,076,196,546.97
5. Step 5: Solve for x
   x = 1,076,196,546.97/42,991.59
6. Step 6: Final answer
   x = 25,032.72