Finding the Fourth Proportional to 105,991.74, 158,988.51 and 31,113.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,991.74 : 158,988.51 = 31,113.12 : x
2. Step 2: Convert to fraction form
   105,991.74/158,988.51 = 31,113.12/x
3. Step 3: Cross multiply
   105,991.74x = 158,988.51 × 31,113.12
4. Step 4: Simplify right side
   105,991.74x = 4,946,628,590.25
5. Step 5: Solve for x
   x = 4,946,628,590.25/105,991.74
6. Step 6: Final answer
   x = 46,669.94