Finding the Fourth Proportional to 105,499.31, 158,139.61 and 65,965.64

Step by Step Solution

1. Step 1: Write the proportion equation
   105,499.31 : 158,139.61 = 65,965.64 : x
2. Step 2: Convert to fraction form
   105,499.31/158,139.61 = 65,965.64/x
3. Step 3: Cross multiply
   105,499.31x = 158,139.61 × 65,965.64
4. Step 4: Simplify right side
   105,499.31x = 10,431,779,627.39
5. Step 5: Solve for x
   x = 10,431,779,627.39/105,499.31
6. Step 6: Final answer
   x = 98,880.08