Finding the Fourth Proportional to 120,363.10, 166,099.89 and 65,172.16

Step by Step Solution

1. Step 1: Write the proportion equation
   120,363.10 : 166,099.89 = 65,172.16 : x
2. Step 2: Convert to fraction form
   120,363.10/166,099.89 = 65,172.16/x
3. Step 3: Cross multiply
   120,363.10x = 166,099.89 × 65,172.16
4. Step 4: Simplify right side
   120,363.10x = 10,825,089,252.28
5. Step 5: Solve for x
   x = 10,825,089,252.28/120,363.10
6. Step 6: Final answer
   x = 89,936.94