Finding the Fourth Proportional to 1,185.90, 1,777.77 and 608.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.90 : 1,777.77 = 608.10 : x
2. Step 2: Convert to fraction form
   1,185.90/1,777.77 = 608.10/x
3. Step 3: Cross multiply
   1,185.90x = 1,777.77 × 608.10
4. Step 4: Simplify right side
   1,185.90x = 1,081,061.94
5. Step 5: Solve for x
   x = 1,081,061.94/1,185.90
6. Step 6: Final answer
   x = 911.60