Finding the Fourth Proportional to 105,989.74, 158,985.51 and 31,111.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,989.74 : 158,985.51 = 31,111.12 : x
2. Step 2: Convert to fraction form
   105,989.74/158,985.51 = 31,111.12/x
3. Step 3: Cross multiply
   105,989.74x = 158,985.51 × 31,111.12
4. Step 4: Simplify right side
   105,989.74x = 4,946,217,279.87
5. Step 5: Solve for x
   x = 4,946,217,279.87/105,989.74
6. Step 6: Final answer
   x = 46,666.94