Finding the Fourth Proportional to 1,099.42, 1,648.43 and 551.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.42 : 1,648.43 = 551.30 : x
2. Step 2: Convert to fraction form
   1,099.42/1,648.43 = 551.30/x
3. Step 3: Cross multiply
   1,099.42x = 1,648.43 × 551.30
4. Step 4: Simplify right side
   1,099.42x = 908,779.46
5. Step 5: Solve for x
   x = 908,779.46/1,099.42
6. Step 6: Final answer
   x = 826.60