Finding the Fourth Proportional to 139,234.71, 208,571.16 and 64,250.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,234.71 : 208,571.16 = 64,250.69 : x
2. Step 2: Convert to fraction form
   139,234.71/208,571.16 = 64,250.69/x
3. Step 3: Cross multiply
   139,234.71x = 208,571.16 × 64,250.69
4. Step 4: Simplify right side
   139,234.71x = 13,400,840,142.18
5. Step 5: Solve for x
   x = 13,400,840,142.18/139,234.71
6. Step 6: Final answer
   x = 96,246.40