Finding the Fourth Proportional to 91,069.30, 136,544.55 and 81,738.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,069.30 : 136,544.55 = 81,738.10 : x
2. Step 2: Convert to fraction form
   91,069.30/136,544.55 = 81,738.10/x
3. Step 3: Cross multiply
   91,069.30x = 136,544.55 × 81,738.10
4. Step 4: Simplify right side
   91,069.30x = 11,160,892,082.36
5. Step 5: Solve for x
   x = 11,160,892,082.36/91,069.30
6. Step 6: Final answer
   x = 122,553.84