Finding the Fourth Proportional to 105,700.28, 158,384.13 and 81,743.23

Step by Step Solution

1. Step 1: Write the proportion equation
   105,700.28 : 158,384.13 = 81,743.23 : x
2. Step 2: Convert to fraction form
   105,700.28/158,384.13 = 81,743.23/x
3. Step 3: Cross multiply
   105,700.28x = 158,384.13 × 81,743.23
4. Step 4: Simplify right side
   105,700.28x = 12,946,830,960.88
5. Step 5: Solve for x
   x = 12,946,830,960.88/105,700.28
6. Step 6: Final answer
   x = 122,486.25