Finding the Fourth Proportional to 78,389.89, 108,136.58 and 49,658.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78,389.89 : 108,136.58 = 49,658.86 : x
2. Step 2: Convert to fraction form
   78,389.89/108,136.58 = 49,658.86/x
3. Step 3: Cross multiply
   78,389.89x = 108,136.58 × 49,658.86
4. Step 4: Simplify right side
   78,389.89x = 5,369,939,287.10
5. Step 5: Solve for x
   x = 5,369,939,287.10/78,389.89
6. Step 6: Final answer
   x = 68,502.96