Finding the Fourth Proportional to 116,905.50, 161,345.39 and 65,928.69

Step by Step Solution

1. Step 1: Write the proportion equation
   116,905.50 : 161,345.39 = 65,928.69 : x
2. Step 2: Convert to fraction form
   116,905.50/161,345.39 = 65,928.69/x
3. Step 3: Cross multiply
   116,905.50x = 161,345.39 × 65,928.69
4. Step 4: Simplify right side
   116,905.50x = 10,637,289,870.60
5. Step 5: Solve for x
   x = 10,637,289,870.60/116,905.50
6. Step 6: Final answer
   x = 90,990.50