Finding the Fourth Proportional to 284,870.50, 393,105.39 and 155,783.50

Step by Step Solution

1. Step 1: Write the proportion equation
   284,870.50 : 393,105.39 = 155,783.50 : x
2. Step 2: Convert to fraction form
   284,870.50/393,105.39 = 155,783.50/x
3. Step 3: Cross multiply
   284,870.50x = 393,105.39 × 155,783.50
4. Step 4: Simplify right side
   284,870.50x = 61,239,331,956.11
5. Step 5: Solve for x
   x = 61,239,331,956.11/284,870.50
6. Step 6: Final answer
   x = 214,972.53