Finding the Fourth Proportional to 105,861.57, 158,858.19 and 65,958.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,861.57 : 158,858.19 = 65,958.90 : x
2. Step 2: Convert to fraction form
   105,861.57/158,858.19 = 65,958.90/x
3. Step 3: Cross multiply
   105,861.57x = 158,858.19 × 65,958.90
4. Step 4: Simplify right side
   105,861.57x = 10,478,111,468.39
5. Step 5: Solve for x
   x = 10,478,111,468.39/105,861.57
6. Step 6: Final answer
   x = 98,979.37