Finding the Fourth Proportional to 105,959.09, 158,938.71 and 66,543.88

Step by Step Solution

1. Step 1: Write the proportion equation
   105,959.09 : 158,938.71 = 66,543.88 : x
2. Step 2: Convert to fraction form
   105,959.09/158,938.71 = 66,543.88/x
3. Step 3: Cross multiply
   105,959.09x = 158,938.71 × 66,543.88
4. Step 4: Simplify right side
   105,959.09x = 10,576,398,096.72
5. Step 5: Solve for x
   x = 10,576,398,096.72/105,959.09
6. Step 6: Final answer
   x = 99,815.87