Finding the Fourth Proportional to 139,776.24, 209,679.12 and 80,610.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,776.24 : 209,679.12 = 80,610.60 : x
2. Step 2: Convert to fraction form
   139,776.24/209,679.12 = 80,610.60/x
3. Step 3: Cross multiply
   139,776.24x = 209,679.12 × 80,610.60
4. Step 4: Simplify right side
   139,776.24x = 16,902,359,670.67
5. Step 5: Solve for x
   x = 16,902,359,670.67/139,776.24
6. Step 6: Final answer
   x = 120,924.41