Finding the Fourth Proportional to 384,928.79, 531,155.36 and 212,823.50

Step by Step Solution

1. Step 1: Write the proportion equation
   384,928.79 : 531,155.36 = 212,823.50 : x
2. Step 2: Convert to fraction form
   384,928.79/531,155.36 = 212,823.50/x
3. Step 3: Cross multiply
   384,928.79x = 531,155.36 × 212,823.50
4. Step 4: Simplify right side
   384,928.79x = 113,042,339,039.07
5. Step 5: Solve for x
   x = 113,042,339,039.07/384,928.79
6. Step 6: Final answer
   x = 293,670.79