Finding the Fourth Proportional to 105,917.21, 158,897.69 and 31,039.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,917.21 : 158,897.69 = 31,039.80 : x
2. Step 2: Convert to fraction form
   105,917.21/158,897.69 = 31,039.80/x
3. Step 3: Cross multiply
   105,917.21x = 158,897.69 × 31,039.80
4. Step 4: Simplify right side
   105,917.21x = 4,932,152,362.86
5. Step 5: Solve for x
   x = 4,932,152,362.86/105,917.21
6. Step 6: Final answer
   x = 46,566.11