Finding the Fourth Proportional to 118,086.48, 177,064.72 and 80,688.78

Step by Step Solution

1. Step 1: Write the proportion equation
   118,086.48 : 177,064.72 = 80,688.78 : x
2. Step 2: Convert to fraction form
   118,086.48/177,064.72 = 80,688.78/x
3. Step 3: Cross multiply
   118,086.48x = 177,064.72 × 80,688.78
4. Step 4: Simplify right side
   118,086.48x = 14,287,136,237.84
5. Step 5: Solve for x
   x = 14,287,136,237.84/118,086.48
6. Step 6: Final answer
   x = 120,988.76