Finding the Fourth Proportional to 139,399.33, 209,204.15 and 64,571.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,399.33 : 209,204.15 = 64,571.98 : x
2. Step 2: Convert to fraction form
   139,399.33/209,204.15 = 64,571.98/x
3. Step 3: Cross multiply
   139,399.33x = 209,204.15 × 64,571.98
4. Step 4: Simplify right side
   139,399.33x = 13,508,725,143.70
5. Step 5: Solve for x
   x = 13,508,725,143.70/139,399.33
6. Step 6: Final answer
   x = 96,906.67