Finding the Fourth Proportional to 42,728.30, 64,048.71 and 21,629.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,728.30 : 64,048.71 = 21,629.22 : x
2. Step 2: Convert to fraction form
   42,728.30/64,048.71 = 21,629.22/x
3. Step 3: Cross multiply
   42,728.30x = 64,048.71 × 21,629.22
4. Step 4: Simplify right side
   42,728.30x = 1,385,323,639.31
5. Step 5: Solve for x
   x = 1,385,323,639.31/42,728.30
6. Step 6: Final answer
   x = 32,421.69