Finding the Fourth Proportional to 1,131.78, 1,697.78 and 310.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.78 : 1,697.78 = 310.06 : x
2. Step 2: Convert to fraction form
   1,131.78/1,697.78 = 310.06/x
3. Step 3: Cross multiply
   1,131.78x = 1,697.78 × 310.06
4. Step 4: Simplify right side
   1,131.78x = 526,413.67
5. Step 5: Solve for x
   x = 526,413.67/1,131.78
6. Step 6: Final answer
   x = 465.12