Finding the Fourth Proportional to 42,728.04, 64,036.29 and 30,921.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,728.04 : 64,036.29 = 30,921.57 : x
2. Step 2: Convert to fraction form
   42,728.04/64,036.29 = 30,921.57/x
3. Step 3: Cross multiply
   42,728.04x = 64,036.29 × 30,921.57
4. Step 4: Simplify right side
   42,728.04x = 1,980,102,623.78
5. Step 5: Solve for x
   x = 1,980,102,623.78/42,728.04
6. Step 6: Final answer
   x = 46,342.00