Finding the Fourth Proportional to 443,978.06, 612,481.95 and 290,975.54

Step by Step Solution

1. Step 1: Write the proportion equation
   443,978.06 : 612,481.95 = 290,975.54 : x
2. Step 2: Convert to fraction form
   443,978.06/612,481.95 = 290,975.54/x
3. Step 3: Cross multiply
   443,978.06x = 612,481.95 × 290,975.54
4. Step 4: Simplify right side
   443,978.06x = 178,217,266,141.50
5. Step 5: Solve for x
   x = 178,217,266,141.50/443,978.06
6. Step 6: Final answer
   x = 401,410.07