Finding the Fourth Proportional to 139,646.94, 209,306.33 and 64,608.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139,646.94 : 209,306.33 = 64,608.54 : x
2. Step 2: Convert to fraction form
   139,646.94/209,306.33 = 64,608.54/x
3. Step 3: Cross multiply
   139,646.94x = 209,306.33 × 64,608.54
4. Step 4: Simplify right side
   139,646.94x = 13,522,975,528.40
5. Step 5: Solve for x
   x = 13,522,975,528.40/139,646.94
6. Step 6: Final answer
   x = 96,836.89