Finding the Fourth Proportional to 72,233.36, 99,641.92 and 42,015.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,233.36 : 99,641.92 = 42,015.28 : x
2. Step 2: Convert to fraction form
   72,233.36/99,641.92 = 42,015.28/x
3. Step 3: Cross multiply
   72,233.36x = 99,641.92 × 42,015.28
4. Step 4: Simplify right side
   72,233.36x = 4,186,483,168.54
5. Step 5: Solve for x
   x = 4,186,483,168.54/72,233.36
6. Step 6: Final answer
   x = 57,957.75