Finding the Fourth Proportional to 412,062.72, 618,186.72 and 222,518.88

Step by Step Solution

1. Step 1: Write the proportion equation
   412,062.72 : 618,186.72 = 222,518.88 : x
2. Step 2: Convert to fraction form
   412,062.72/618,186.72 = 222,518.88/x
3. Step 3: Cross multiply
   412,062.72x = 618,186.72 × 222,518.88
4. Step 4: Simplify right side
   412,062.72x = 137,558,216,565.27
5. Step 5: Solve for x
   x = 137,558,216,565.27/412,062.72
6. Step 6: Final answer
   x = 333,828.35