Finding the Fourth Proportional to 42,940.62, 64,379.79 and 28,865.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42,940.62 : 64,379.79 = 28,865.73 : x
2. Step 2: Convert to fraction form
   42,940.62/64,379.79 = 28,865.73/x
3. Step 3: Cross multiply
   42,940.62x = 64,379.79 × 28,865.73
4. Step 4: Simplify right side
   42,940.62x = 1,858,369,877.02
5. Step 5: Solve for x
   x = 1,858,369,877.02/42,940.62
6. Step 6: Final answer
   x = 43,277.67