Finding the Fourth Proportional to 400,738.83, 553,019.82 and 216,976.83

Step by Step Solution

1. Step 1: Write the proportion equation
   400,738.83 : 553,019.82 = 216,976.83 : x
2. Step 2: Convert to fraction form
   400,738.83/553,019.82 = 216,976.83/x
3. Step 3: Cross multiply
   400,738.83x = 553,019.82 × 216,976.83
4. Step 4: Simplify right side
   400,738.83x = 119,992,487,470.77
5. Step 5: Solve for x
   x = 119,992,487,470.77/400,738.83
6. Step 6: Final answer
   x = 299,428.15