Finding the Fourth Proportional to 402,981.48, 556,106.72 and 221,682.83

Step by Step Solution

1. Step 1: Write the proportion equation
   402,981.48 : 556,106.72 = 221,682.83 : x
2. Step 2: Convert to fraction form
   402,981.48/556,106.72 = 221,682.83/x
3. Step 3: Cross multiply
   402,981.48x = 556,106.72 × 221,682.83
4. Step 4: Simplify right side
   402,981.48x = 123,279,307,582.67
5. Step 5: Solve for x
   x = 123,279,307,582.67/402,981.48
6. Step 6: Final answer
   x = 305,918.05