Finding the Fourth Proportional to 1,521.58, 2,099.59 and 891.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.58 : 2,099.59 = 891.64 : x
2. Step 2: Convert to fraction form
   1,521.58/2,099.59 = 891.64/x
3. Step 3: Cross multiply
   1,521.58x = 2,099.59 × 891.64
4. Step 4: Simplify right side
   1,521.58x = 1,872,078.43
5. Step 5: Solve for x
   x = 1,872,078.43/1,521.58
6. Step 6: Final answer
   x = 1,230.35