Finding the Fourth Proportional to 139,940.88, 209,723.58 and 76,665.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139,940.88 : 209,723.58 = 76,665.51 : x
2. Step 2: Convert to fraction form
   139,940.88/209,723.58 = 76,665.51/x
3. Step 3: Cross multiply
   139,940.88x = 209,723.58 × 76,665.51
4. Step 4: Simplify right side
   139,940.88x = 16,078,565,219.73
5. Step 5: Solve for x
   x = 16,078,565,219.73/139,940.88
6. Step 6: Final answer
   x = 114,895.41