Finding the Fourth Proportional to 105,632.78, 158,342.56 and 66,217.58

Step by Step Solution

1. Step 1: Write the proportion equation
   105,632.78 : 158,342.56 = 66,217.58 : x
2. Step 2: Convert to fraction form
   105,632.78/158,342.56 = 66,217.58/x
3. Step 3: Cross multiply
   105,632.78x = 158,342.56 × 66,217.58
4. Step 4: Simplify right side
   105,632.78x = 10,485,060,011.40
5. Step 5: Solve for x
   x = 10,485,060,011.40/105,632.78
6. Step 6: Final answer
   x = 99,259.53