Finding the Fourth Proportional to 42,818.27, 64,133.78 and 21,721.95

Step by Step Solution

1. Step 1: Write the proportion equation
   42,818.27 : 64,133.78 = 21,721.95 : x
2. Step 2: Convert to fraction form
   42,818.27/64,133.78 = 21,721.95/x
3. Step 3: Cross multiply
   42,818.27x = 64,133.78 × 21,721.95
4. Step 4: Simplify right side
   42,818.27x = 1,393,110,653.86
5. Step 5: Solve for x
   x = 1,393,110,653.86/42,818.27
6. Step 6: Final answer
   x = 32,535.43