Finding the Fourth Proportional to 1,131.40, 1,696.89 and 515.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.40 : 1,696.89 = 515.12 : x
2. Step 2: Convert to fraction form
   1,131.40/1,696.89 = 515.12/x
3. Step 3: Cross multiply
   1,131.40x = 1,696.89 × 515.12
4. Step 4: Simplify right side
   1,131.40x = 874,101.98
5. Step 5: Solve for x
   x = 874,101.98/1,131.40
6. Step 6: Final answer
   x = 772.59