Finding the Fourth Proportional to 91,186, 136,498.72 and 77,733.89

Step by Step Solution

1. Step 1: Write the proportion equation
   91,186 : 136,498.72 = 77,733.89 : x
2. Step 2: Convert to fraction form
   91,186/136,498.72 = 77,733.89/x
3. Step 3: Cross multiply
   91,186x = 136,498.72 × 77,733.89
4. Step 4: Simplify right side
   91,186x = 10,610,576,485.62
5. Step 5: Solve for x
   x = 10,610,576,485.62/91,186
6. Step 6: Final answer
   x = 116,361.90