Finding the Fourth Proportional to 223,818.72, 308,871 and 123,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   223,818.72 : 308,871 = 123,216.72 : x
2. Step 2: Convert to fraction form
   223,818.72/308,871 = 123,216.72/x
3. Step 3: Cross multiply
   223,818.72x = 308,871 × 123,216.72
4. Step 4: Simplify right side
   223,818.72x = 38,058,071,523.12
5. Step 5: Solve for x
   x = 38,058,071,523.12/223,818.72
6. Step 6: Final answer
   x = 170,039.72