Finding the Fourth Proportional to 1,131.19, 1,694.47 and 667.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.19 : 1,694.47 = 667.57 : x
2. Step 2: Convert to fraction form
   1,131.19/1,694.47 = 667.57/x
3. Step 3: Cross multiply
   1,131.19x = 1,694.47 × 667.57
4. Step 4: Simplify right side
   1,131.19x = 1,131,165.53
5. Step 5: Solve for x
   x = 1,131,165.53/1,131.19
6. Step 6: Final answer
   x = 999.98