Finding the Fourth Proportional to 403,014.96, 556,139.16 and 221,697.72

Step by Step Solution

1. Step 1: Write the proportion equation
   403,014.96 : 556,139.16 = 221,697.72 : x
2. Step 2: Convert to fraction form
   403,014.96/556,139.16 = 221,697.72/x
3. Step 3: Cross multiply
   403,014.96x = 556,139.16 × 221,697.72
4. Step 4: Simplify right side
   403,014.96x = 123,294,783,774.72
5. Step 5: Solve for x
   x = 123,294,783,774.72/403,014.96
6. Step 6: Final answer
   x = 305,931.03