Finding the Fourth Proportional to 663,221.31, 995,025.69 and 213,932.22

Step by Step Solution

1. Step 1: Write the proportion equation
   663,221.31 : 995,025.69 = 213,932.22 : x
2. Step 2: Convert to fraction form
   663,221.31/995,025.69 = 213,932.22/x
3. Step 3: Cross multiply
   663,221.31x = 995,025.69 × 213,932.22
4. Step 4: Simplify right side
   663,221.31x = 212,868,054,818.73
5. Step 5: Solve for x
   x = 212,868,054,818.73/663,221.31
6. Step 6: Final answer
   x = 320,960.82