Finding the Fourth Proportional to 402,774.28, 555,813.56 and 221,475.42

Step by Step Solution

1. Step 1: Write the proportion equation
   402,774.28 : 555,813.56 = 221,475.42 : x
2. Step 2: Convert to fraction form
   402,774.28/555,813.56 = 221,475.42/x
3. Step 3: Cross multiply
   402,774.28x = 555,813.56 × 221,475.42
4. Step 4: Simplify right side
   402,774.28x = 123,099,042,196.38
5. Step 5: Solve for x
   x = 123,099,042,196.38/402,774.28
6. Step 6: Final answer
   x = 305,627.86