Finding the Fourth Proportional to 1,131.40, 1,697.10 and 309.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.40 : 1,697.10 = 309.62 : x
2. Step 2: Convert to fraction form
   1,131.40/1,697.10 = 309.62/x
3. Step 3: Cross multiply
   1,131.40x = 1,697.10 × 309.62
4. Step 4: Simplify right side
   1,131.40x = 525,448.78
5. Step 5: Solve for x
   x = 525,448.78/1,131.40
6. Step 6: Final answer
   x = 464.42