Finding the Fourth Proportional to 139,522.56, 209,279.16 and 60,636.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,522.56 : 209,279.16 = 60,636.78 : x
2. Step 2: Convert to fraction form
   139,522.56/209,279.16 = 60,636.78/x
3. Step 3: Cross multiply
   139,522.56x = 209,279.16 × 60,636.78
4. Step 4: Simplify right side
   139,522.56x = 12,690,014,383.50
5. Step 5: Solve for x
   x = 12,690,014,383.50/139,522.56
6. Step 6: Final answer
   x = 90,953.14