Finding the Fourth Proportional to 107,811.27, 161,519.76 and 78,155.55

Step by Step Solution

1. Step 1: Write the proportion equation
   107,811.27 : 161,519.76 = 78,155.55 : x
2. Step 2: Convert to fraction form
   107,811.27/161,519.76 = 78,155.55/x
3. Step 3: Cross multiply
   107,811.27x = 161,519.76 × 78,155.55
4. Step 4: Simplify right side
   107,811.27x = 12,623,665,678.67
5. Step 5: Solve for x
   x = 12,623,665,678.67/107,811.27
6. Step 6: Final answer
   x = 117,090.41