Finding the Fourth Proportional to 76,658.30, 105,728.42 and 49,809.53

Step by Step Solution

1. Step 1: Write the proportion equation
   76,658.30 : 105,728.42 = 49,809.53 : x
2. Step 2: Convert to fraction form
   76,658.30/105,728.42 = 49,809.53/x
3. Step 3: Cross multiply
   76,658.30x = 105,728.42 × 49,809.53
4. Step 4: Simplify right side
   76,658.30x = 5,266,283,296.69
5. Step 5: Solve for x
   x = 5,266,283,296.69/76,658.30
6. Step 6: Final answer
   x = 68,698.15