Finding the Fourth Proportional to 403,401.72, 556,689.78 and 222,109.86

Step by Step Solution

1. Step 1: Write the proportion equation
   403,401.72 : 556,689.78 = 222,109.86 : x
2. Step 2: Convert to fraction form
   403,401.72/556,689.78 = 222,109.86/x
3. Step 3: Cross multiply
   403,401.72x = 556,689.78 × 222,109.86
4. Step 4: Simplify right side
   403,401.72x = 123,646,289,099.23
5. Step 5: Solve for x
   x = 123,646,289,099.23/403,401.72
6. Step 6: Final answer
   x = 306,509.08