Finding the Fourth Proportional to 139,009.72, 208,846.94 and 89,187.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,009.72 : 208,846.94 = 89,187.68 : x
2. Step 2: Convert to fraction form
   139,009.72/208,846.94 = 89,187.68/x
3. Step 3: Cross multiply
   139,009.72x = 208,846.94 × 89,187.68
4. Step 4: Simplify right side
   139,009.72x = 18,626,574,053.70
5. Step 5: Solve for x
   x = 18,626,574,053.70/139,009.72
6. Step 6: Final answer
   x = 133,994.76