Finding the Fourth Proportional to 115,607.82, 173,399.31 and 78,406.68

Step by Step Solution

1. Step 1: Write the proportion equation
   115,607.82 : 173,399.31 = 78,406.68 : x
2. Step 2: Convert to fraction form
   115,607.82/173,399.31 = 78,406.68/x
3. Step 3: Cross multiply
   115,607.82x = 173,399.31 × 78,406.68
4. Step 4: Simplify right side
   115,607.82x = 13,595,664,211.39
5. Step 5: Solve for x
   x = 13,595,664,211.39/115,607.82
6. Step 6: Final answer
   x = 117,601.60