Finding the Fourth Proportional to 91,085.04, 135,722.06 and 81,147.96

Step by Step Solution

1. Step 1: Write the proportion equation
   91,085.04 : 135,722.06 = 81,147.96 : x
2. Step 2: Convert to fraction form
   91,085.04/135,722.06 = 81,147.96/x
3. Step 3: Cross multiply
   91,085.04x = 135,722.06 × 81,147.96
4. Step 4: Simplify right side
   91,085.04x = 11,013,568,296.00
5. Step 5: Solve for x
   x = 11,013,568,296.00/91,085.04
6. Step 6: Final answer
   x = 120,915.23