Finding the Fourth Proportional to 139,176.87, 208,603.94 and 64,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,176.87 : 208,603.94 = 64,139.38 : x
2. Step 2: Convert to fraction form
   139,176.87/208,603.94 = 64,139.38/x
3. Step 3: Cross multiply
   139,176.87x = 208,603.94 × 64,139.38
4. Step 4: Simplify right side
   139,176.87x = 13,379,727,377.16
5. Step 5: Solve for x
   x = 13,379,727,377.16/139,176.87
6. Step 6: Final answer
   x = 96,134.71