Finding the Fourth Proportional to 403,128.83, 556,303.83 and 221,823.80

Step by Step Solution

1. Step 1: Write the proportion equation
   403,128.83 : 556,303.83 = 221,823.80 : x
2. Step 2: Convert to fraction form
   403,128.83/556,303.83 = 221,823.80/x
3. Step 3: Cross multiply
   403,128.83x = 556,303.83 × 221,823.80
4. Step 4: Simplify right side
   403,128.83x = 123,401,426,743.64
5. Step 5: Solve for x
   x = 123,401,426,743.64/403,128.83
6. Step 6: Final answer
   x = 306,109.16