Finding the Fourth Proportional to 1,089.82, 1,630.47 and 915.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.82 : 1,630.47 = 915.48 : x
2. Step 2: Convert to fraction form
   1,089.82/1,630.47 = 915.48/x
3. Step 3: Cross multiply
   1,089.82x = 1,630.47 × 915.48
4. Step 4: Simplify right side
   1,089.82x = 1,492,662.68
5. Step 5: Solve for x
   x = 1,492,662.68/1,089.82
6. Step 6: Final answer
   x = 1,369.64