Finding the Fourth Proportional to 42,908.69, 64,318.35 and 14,424.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,908.69 : 64,318.35 = 14,424.50 : x
2. Step 2: Convert to fraction form
   42,908.69/64,318.35 = 14,424.50/x
3. Step 3: Cross multiply
   42,908.69x = 64,318.35 × 14,424.50
4. Step 4: Simplify right side
   42,908.69x = 927,760,039.58
5. Step 5: Solve for x
   x = 927,760,039.58/42,908.69
6. Step 6: Final answer
   x = 21,621.73