Finding the Fourth Proportional to 155,062.76, 213,991.77 and 87,091.71

Step by Step Solution

1. Step 1: Write the proportion equation
   155,062.76 : 213,991.77 = 87,091.71 : x
2. Step 2: Convert to fraction form
   155,062.76/213,991.77 = 87,091.71/x
3. Step 3: Cross multiply
   155,062.76x = 213,991.77 × 87,091.71
4. Step 4: Simplify right side
   155,062.76x = 18,636,908,105.27
5. Step 5: Solve for x
   x = 18,636,908,105.27/155,062.76
6. Step 6: Final answer
   x = 120,189.46