Finding the Fourth Proportional to 139,105.98, 208,380.69 and 64,123.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,105.98 : 208,380.69 = 64,123.56 : x
2. Step 2: Convert to fraction form
   139,105.98/208,380.69 = 64,123.56/x
3. Step 3: Cross multiply
   139,105.98x = 208,380.69 × 64,123.56
4. Step 4: Simplify right side
   139,105.98x = 13,362,111,678.06
5. Step 5: Solve for x
   x = 13,362,111,678.06/139,105.98
6. Step 6: Final answer
   x = 96,057.06