Finding the Fourth Proportional to 1,131.72, 1,697.52 and 309.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.72 : 1,697.52 = 309.97 : x
2. Step 2: Convert to fraction form
   1,131.72/1,697.52 = 309.97/x
3. Step 3: Cross multiply
   1,131.72x = 1,697.52 × 309.97
4. Step 4: Simplify right side
   1,131.72x = 526,180.27
5. Step 5: Solve for x
   x = 526,180.27/1,131.72
6. Step 6: Final answer
   x = 464.94