Finding the Fourth Proportional to 403,128.52, 556,303.40 and 221,823.48

Step by Step Solution

1. Step 1: Write the proportion equation
   403,128.52 : 556,303.40 = 221,823.48 : x
2. Step 2: Convert to fraction form
   403,128.52/556,303.40 = 221,823.48/x
3. Step 3: Cross multiply
   403,128.52x = 556,303.40 × 221,823.48
4. Step 4: Simplify right side
   403,128.52x = 123,401,155,014.72
5. Step 5: Solve for x
   x = 123,401,155,014.72/403,128.52
6. Step 6: Final answer
   x = 306,108.72