Finding the Fourth Proportional to 424,145.91, 635,978.67 and 139,759.35

Step by Step Solution

1. Step 1: Write the proportion equation
   424,145.91 : 635,978.67 = 139,759.35 : x
2. Step 2: Convert to fraction form
   424,145.91/635,978.67 = 139,759.35/x
3. Step 3: Cross multiply
   424,145.91x = 635,978.67 × 139,759.35
4. Step 4: Simplify right side
   424,145.91x = 88,883,965,533.06
5. Step 5: Solve for x
   x = 88,883,965,533.06/424,145.91
6. Step 6: Final answer
   x = 209,559.88