Finding the Fourth Proportional to 105,632.38, 158,341.89 and 66,217.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,632.38 : 158,341.89 = 66,217.12 : x
2. Step 2: Convert to fraction form
   105,632.38/158,341.89 = 66,217.12/x
3. Step 3: Cross multiply
   105,632.38x = 158,341.89 × 66,217.12
4. Step 4: Simplify right side
   105,632.38x = 10,484,943,931.16
5. Step 5: Solve for x
   x = 10,484,943,931.16/105,632.38
6. Step 6: Final answer
   x = 99,258.81