Finding the Fourth Proportional to 1,521.45, 2,098.71 and 1,189.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.45 : 2,098.71 = 1,189.35 : x
2. Step 2: Convert to fraction form
   1,521.45/2,098.71 = 1,189.35/x
3. Step 3: Cross multiply
   1,521.45x = 2,098.71 × 1,189.35
4. Step 4: Simplify right side
   1,521.45x = 2,496,100.74
5. Step 5: Solve for x
   x = 2,496,100.74/1,521.45
6. Step 6: Final answer
   x = 1,640.61