Finding the Fourth Proportional to 91,188, 136,501.72 and 77,735.89

Step by Step Solution

1. Step 1: Write the proportion equation
   91,188 : 136,501.72 = 77,735.89 : x
2. Step 2: Convert to fraction form
   91,188/136,501.72 = 77,735.89/x
3. Step 3: Cross multiply
   91,188x = 136,501.72 × 77,735.89
4. Step 4: Simplify right side
   91,188x = 10,611,082,690.73
5. Step 5: Solve for x
   x = 10,611,082,690.73/91,188
6. Step 6: Final answer
   x = 116,364.90