Finding the Fourth Proportional to 91,805.70, 137,514.15 and 81,956.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,805.70 : 137,514.15 = 81,956.10 : x
2. Step 2: Convert to fraction form
   91,805.70/137,514.15 = 81,956.10/x
3. Step 3: Cross multiply
   91,805.70x = 137,514.15 × 81,956.10
4. Step 4: Simplify right side
   91,805.70x = 11,270,123,428.82
5. Step 5: Solve for x
   x = 11,270,123,428.82/91,805.70
6. Step 6: Final answer
   x = 122,760.61