Finding the Fourth Proportional to 261,155.76, 391,761.72 and 111,411.87

Step by Step Solution

1. Step 1: Write the proportion equation
   261,155.76 : 391,761.72 = 111,411.87 : x
2. Step 2: Convert to fraction form
   261,155.76/391,761.72 = 111,411.87/x
3. Step 3: Cross multiply
   261,155.76x = 391,761.72 × 111,411.87
4. Step 4: Simplify right side
   261,155.76x = 43,646,905,819.62
5. Step 5: Solve for x
   x = 43,646,905,819.62/261,155.76
6. Step 6: Final answer
   x = 167,129.78