Finding the Fourth Proportional to 408,356.01, 612,709.56 and 141,971.31

Step by Step Solution

1. Step 1: Write the proportion equation
   408,356.01 : 612,709.56 = 141,971.31 : x
2. Step 2: Convert to fraction form
   408,356.01/612,709.56 = 141,971.31/x
3. Step 3: Cross multiply
   408,356.01x = 612,709.56 × 141,971.31
4. Step 4: Simplify right side
   408,356.01x = 86,987,178,882.72
5. Step 5: Solve for x
   x = 86,987,178,882.72/408,356.01
6. Step 6: Final answer
   x = 213,018.00