Finding the Fourth Proportional to 1,445.55, 2,169.23 and 830.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.55 : 2,169.23 = 830.45 : x
2. Step 2: Convert to fraction form
   1,445.55/2,169.23 = 830.45/x
3. Step 3: Cross multiply
   1,445.55x = 2,169.23 × 830.45
4. Step 4: Simplify right side
   1,445.55x = 1,801,443.00
5. Step 5: Solve for x
   x = 1,801,443.00/1,445.55
6. Step 6: Final answer
   x = 1,246.20