Finding the Fourth Proportional to 86,550.81, 129,099.03 and 78,577.98

Step by Step Solution

1. Step 1: Write the proportion equation
   86,550.81 : 129,099.03 = 78,577.98 : x
2. Step 2: Convert to fraction form
   86,550.81/129,099.03 = 78,577.98/x
3. Step 3: Cross multiply
   86,550.81x = 129,099.03 × 78,577.98
4. Step 4: Simplify right side
   86,550.81x = 10,144,340,997.36
5. Step 5: Solve for x
   x = 10,144,340,997.36/86,550.81
6. Step 6: Final answer
   x = 117,206.77