Finding the Fourth Proportional to 1,521.35, 2,099.45 and 822.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.35 : 2,099.45 = 822.72 : x
2. Step 2: Convert to fraction form
   1,521.35/2,099.45 = 822.72/x
3. Step 3: Cross multiply
   1,521.35x = 2,099.45 × 822.72
4. Step 4: Simplify right side
   1,521.35x = 1,727,259.50
5. Step 5: Solve for x
   x = 1,727,259.50/1,521.35
6. Step 6: Final answer
   x = 1,135.35