Finding the Fourth Proportional to 3,440.78, 5,160.69 and 1,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,440.78 : 5,160.69 = 1,131.50 : x
2. Step 2: Convert to fraction form
   3,440.78/5,160.69 = 1,131.50/x
3. Step 3: Cross multiply
   3,440.78x = 5,160.69 × 1,131.50
4. Step 4: Simplify right side
   3,440.78x = 5,839,320.74
5. Step 5: Solve for x
   x = 5,839,320.74/3,440.78
6. Step 6: Final answer
   x = 1,697.09