Finding the Fourth Proportional to 105,091.20, 157,636.98 and 84,164.34

Step by Step Solution

1. Step 1: Write the proportion equation
   105,091.20 : 157,636.98 = 84,164.34 : x
2. Step 2: Convert to fraction form
   105,091.20/157,636.98 = 84,164.34/x
3. Step 3: Cross multiply
   105,091.20x = 157,636.98 × 84,164.34
4. Step 4: Simplify right side
   105,091.20x = 13,267,412,381.29
5. Step 5: Solve for x
   x = 13,267,412,381.29/105,091.20
6. Step 6: Final answer
   x = 126,246.65