Finding the Fourth Proportional to 2,153.08, 3,229.98 and 920.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.08 : 3,229.98 = 920.50 : x
2. Step 2: Convert to fraction form
   2,153.08/3,229.98 = 920.50/x
3. Step 3: Cross multiply
   2,153.08x = 3,229.98 × 920.50
4. Step 4: Simplify right side
   2,153.08x = 2,973,196.59
5. Step 5: Solve for x
   x = 2,973,196.59/2,153.08
6. Step 6: Final answer
   x = 1,380.90