Finding the Fourth Proportional to 1,131.57, 1,697.31 and 309.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.57 : 1,697.31 = 309.93 : x
2. Step 2: Convert to fraction form
   1,131.57/1,697.31 = 309.93/x
3. Step 3: Cross multiply
   1,131.57x = 1,697.31 × 309.93
4. Step 4: Simplify right side
   1,131.57x = 526,048.45
5. Step 5: Solve for x
   x = 526,048.45/1,131.57
6. Step 6: Final answer
   x = 464.88