Finding the Fourth Proportional to 91,780.65, 137,771.54 and 72,926.48

Step by Step Solution

1. Step 1: Write the proportion equation
   91,780.65 : 137,771.54 = 72,926.48 : x
2. Step 2: Convert to fraction form
   91,780.65/137,771.54 = 72,926.48/x
3. Step 3: Cross multiply
   91,780.65x = 137,771.54 × 72,926.48
4. Step 4: Simplify right side
   91,780.65x = 10,047,192,402.89
5. Step 5: Solve for x
   x = 10,047,192,402.89/91,780.65
6. Step 6: Final answer
   x = 109,469.61