Finding the Fourth Proportional to 42,989.45, 64,445.69 and 16,687.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42,989.45 : 64,445.69 = 16,687.94 : x
2. Step 2: Convert to fraction form
   42,989.45/64,445.69 = 16,687.94/x
3. Step 3: Cross multiply
   42,989.45x = 64,445.69 × 16,687.94
4. Step 4: Simplify right side
   42,989.45x = 1,075,465,527.47
5. Step 5: Solve for x
   x = 1,075,465,527.47/42,989.45
6. Step 6: Final answer
   x = 25,016.97