Finding the Fourth Proportional to 139,878.09, 209,773.40 and 60,912.81

Step by Step Solution

1. Step 1: Write the proportion equation
   139,878.09 : 209,773.40 = 60,912.81 : x
2. Step 2: Convert to fraction form
   139,878.09/209,773.40 = 60,912.81/x
3. Step 3: Cross multiply
   139,878.09x = 209,773.40 × 60,912.81
4. Step 4: Simplify right side
   139,878.09x = 12,777,886,952.69
5. Step 5: Solve for x
   x = 12,777,886,952.69/139,878.09
6. Step 6: Final answer
   x = 91,350.17