Finding the Fourth Proportional to 402,196.82, 555,036.18 and 220,913

Step by Step Solution

1. Step 1: Write the proportion equation
   402,196.82 : 555,036.18 = 220,913 : x
2. Step 2: Convert to fraction form
   402,196.82/555,036.18 = 220,913/x
3. Step 3: Cross multiply
   402,196.82x = 555,036.18 × 220,913
4. Step 4: Simplify right side
   402,196.82x = 122,614,707,632.34
5. Step 5: Solve for x
   x = 122,614,707,632.34/402,196.82
6. Step 6: Final answer
   x = 304,862.45