Finding the Fourth Proportional to 386,360, 533,178.72 and 225,326.72

Step by Step Solution

1. Step 1: Write the proportion equation
   386,360 : 533,178.72 = 225,326.72 : x
2. Step 2: Convert to fraction form
   386,360/533,178.72 = 225,326.72/x
3. Step 3: Cross multiply
   386,360x = 533,178.72 × 225,326.72
4. Step 4: Simplify right side
   386,360x = 120,139,412,151.40
5. Step 5: Solve for x
   x = 120,139,412,151.40/386,360
6. Step 6: Final answer
   x = 310,951.99