Finding the Fourth Proportional to 139,094.37, 208,635.78 and 64,189.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139,094.37 : 208,635.78 = 64,189.62 : x
2. Step 2: Convert to fraction form
   139,094.37/208,635.78 = 64,189.62/x
3. Step 3: Cross multiply
   139,094.37x = 208,635.78 × 64,189.62
4. Step 4: Simplify right side
   139,094.37x = 13,392,251,436.60
5. Step 5: Solve for x
   x = 13,392,251,436.60/139,094.37
6. Step 6: Final answer
   x = 96,281.76