Finding the Fourth Proportional to 282,978.52, 390,520.74 and 155,663.80

Step by Step Solution

1. Step 1: Write the proportion equation
   282,978.52 : 390,520.74 = 155,663.80 : x
2. Step 2: Convert to fraction form
   282,978.52/390,520.74 = 155,663.80/x
3. Step 3: Cross multiply
   282,978.52x = 390,520.74 × 155,663.80
4. Step 4: Simplify right side
   282,978.52x = 60,789,942,367.21
5. Step 5: Solve for x
   x = 60,789,942,367.21/282,978.52
6. Step 6: Final answer
   x = 214,821.76