Finding the Fourth Proportional to 2,153.52, 3,227.86 and 920.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.52 : 3,227.86 = 920.30 : x
2. Step 2: Convert to fraction form
   2,153.52/3,227.86 = 920.30/x
3. Step 3: Cross multiply
   2,153.52x = 3,227.86 × 920.30
4. Step 4: Simplify right side
   2,153.52x = 2,970,599.56
5. Step 5: Solve for x
   x = 2,970,599.56/2,153.52
6. Step 6: Final answer
   x = 1,379.42