Finding the Fourth Proportional to 471,978.72, 651,324.78 and 257,114.21

Step by Step Solution

1. Step 1: Write the proportion equation
   471,978.72 : 651,324.78 = 257,114.21 : x
2. Step 2: Convert to fraction form
   471,978.72/651,324.78 = 257,114.21/x
3. Step 3: Cross multiply
   471,978.72x = 651,324.78 × 257,114.21
4. Step 4: Simplify right side
   471,978.72x = 167,464,853,006.50
5. Step 5: Solve for x
   x = 167,464,853,006.50/471,978.72
6. Step 6: Final answer
   x = 354,814.41