Finding the Fourth Proportional to 139,644.53, 209,499.60 and 39,806.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,644.53 : 209,499.60 = 39,806.16 : x
2. Step 2: Convert to fraction form
   139,644.53/209,499.60 = 39,806.16/x
3. Step 3: Cross multiply
   139,644.53x = 209,499.60 × 39,806.16
4. Step 4: Simplify right side
   139,644.53x = 8,339,373,351.01
5. Step 5: Solve for x
   x = 8,339,373,351.01/139,644.53
6. Step 6: Final answer
   x = 59,718.58