Finding the Fourth Proportional to 282,978.02, 390,520.06 and 155,663.30

Step by Step Solution

1. Step 1: Write the proportion equation
   282,978.02 : 390,520.06 = 155,663.30 : x
2. Step 2: Convert to fraction form
   282,978.02/390,520.06 = 155,663.30/x
3. Step 3: Cross multiply
   282,978.02x = 390,520.06 × 155,663.30
4. Step 4: Simplify right side
   282,978.02x = 60,789,641,255.80
5. Step 5: Solve for x
   x = 60,789,641,255.80/282,978.02
6. Step 6: Final answer
   x = 214,821.07