Finding the Fourth Proportional to 1,128.82, 1,696.30 and 609.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.82 : 1,696.30 = 609.21 : x
2. Step 2: Convert to fraction form
   1,128.82/1,696.30 = 609.21/x
3. Step 3: Cross multiply
   1,128.82x = 1,696.30 × 609.21
4. Step 4: Simplify right side
   1,128.82x = 1,033,402.92
5. Step 5: Solve for x
   x = 1,033,402.92/1,128.82
6. Step 6: Final answer
   x = 915.47