Finding the Fourth Proportional to 86,486.84, 129,477.52 and 78,185.96

Step by Step Solution

1. Step 1: Write the proportion equation
   86,486.84 : 129,477.52 = 78,185.96 : x
2. Step 2: Convert to fraction form
   86,486.84/129,477.52 = 78,185.96/x
3. Step 3: Cross multiply
   86,486.84x = 129,477.52 × 78,185.96
4. Step 4: Simplify right side
   86,486.84x = 10,123,324,199.62
5. Step 5: Solve for x
   x = 10,123,324,199.62/86,486.84
6. Step 6: Final answer
   x = 117,050.46