Finding the Fourth Proportional to 139,729.91, 209,627.41 and 39,891.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,729.91 : 209,627.41 = 39,891.47 : x
2. Step 2: Convert to fraction form
   139,729.91/209,627.41 = 39,891.47/x
3. Step 3: Cross multiply
   139,729.91x = 209,627.41 × 39,891.47
4. Step 4: Simplify right side
   139,729.91x = 8,362,345,961.53
5. Step 5: Solve for x
   x = 8,362,345,961.53/139,729.91
6. Step 6: Final answer
   x = 59,846.50