Finding the Fourth Proportional to 105,185.61, 157,661.52 and 80,143.08

Step by Step Solution

1. Step 1: Write the proportion equation
   105,185.61 : 157,661.52 = 80,143.08 : x
2. Step 2: Convert to fraction form
   105,185.61/157,661.52 = 80,143.08/x
3. Step 3: Cross multiply
   105,185.61x = 157,661.52 × 80,143.08
4. Step 4: Simplify right side
   105,185.61x = 12,635,479,810.28
5. Step 5: Solve for x
   x = 12,635,479,810.28/105,185.61
6. Step 6: Final answer
   x = 120,125.56