Finding the Fourth Proportional to 107,788.55, 161,485.77 and 78,132.83

Step by Step Solution

1. Step 1: Write the proportion equation
   107,788.55 : 161,485.77 = 78,132.83 : x
2. Step 2: Convert to fraction form
   107,788.55/161,485.77 = 78,132.83/x
3. Step 3: Cross multiply
   107,788.55x = 161,485.77 × 78,132.83
4. Step 4: Simplify right side
   107,788.55x = 12,617,339,407.40
5. Step 5: Solve for x
   x = 12,617,339,407.40/107,788.55
6. Step 6: Final answer
   x = 117,056.40