Finding the Fourth Proportional to 116,939.77, 161,269.28 and 76,638.89

Step by Step Solution

1. Step 1: Write the proportion equation
   116,939.77 : 161,269.28 = 76,638.89 : x
2. Step 2: Convert to fraction form
   116,939.77/161,269.28 = 76,638.89/x
3. Step 3: Cross multiply
   116,939.77x = 161,269.28 × 76,638.89
4. Step 4: Simplify right side
   116,939.77x = 12,359,498,917.67
5. Step 5: Solve for x
   x = 12,359,498,917.67/116,939.77
6. Step 6: Final answer
   x = 105,691.15