Finding the Fourth Proportional to 42,690.91, 64,054.83 and 16,389.54

Step by Step Solution

1. Step 1: Write the proportion equation
   42,690.91 : 64,054.83 = 16,389.54 : x
2. Step 2: Convert to fraction form
   42,690.91/64,054.83 = 16,389.54/x
3. Step 3: Cross multiply
   42,690.91x = 64,054.83 × 16,389.54
4. Step 4: Simplify right side
   42,690.91x = 1,049,829,198.48
5. Step 5: Solve for x
   x = 1,049,829,198.48/42,690.91
6. Step 6: Final answer
   x = 24,591.40