Finding the Fourth Proportional to 139,819.77, 209,708.02 and 76,671.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,819.77 : 209,708.02 = 76,671.06 : x
2. Step 2: Convert to fraction form
   139,819.77/209,708.02 = 76,671.06/x
3. Step 3: Cross multiply
   139,819.77x = 209,708.02 × 76,671.06
4. Step 4: Simplify right side
   139,819.77x = 16,078,535,992.22
5. Step 5: Solve for x
   x = 16,078,535,992.22/139,819.77
6. Step 6: Final answer
   x = 114,994.72