Finding the Fourth Proportional to 1,131.86, 1,697.51 and 438.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.86 : 1,697.51 = 438.27 : x
2. Step 2: Convert to fraction form
   1,131.86/1,697.51 = 438.27/x
3. Step 3: Cross multiply
   1,131.86x = 1,697.51 × 438.27
4. Step 4: Simplify right side
   1,131.86x = 743,965.52
5. Step 5: Solve for x
   x = 743,965.52/1,131.86
6. Step 6: Final answer
   x = 657.30