Finding the Fourth Proportional to 139,524.56, 209,282.16 and 60,638.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,524.56 : 209,282.16 = 60,638.78 : x
2. Step 2: Convert to fraction form
   139,524.56/209,282.16 = 60,638.78/x
3. Step 3: Cross multiply
   139,524.56x = 209,282.16 × 60,638.78
4. Step 4: Simplify right side
   139,524.56x = 12,690,614,858.16
5. Step 5: Solve for x
   x = 12,690,614,858.16/139,524.56
6. Step 6: Final answer
   x = 90,956.14