Finding the Fourth Proportional to 1,404.98, 1,938.48 and 845.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.98 : 1,938.48 = 845.20 : x
2. Step 2: Convert to fraction form
   1,404.98/1,938.48 = 845.20/x
3. Step 3: Cross multiply
   1,404.98x = 1,938.48 × 845.20
4. Step 4: Simplify right side
   1,404.98x = 1,638,403.30
5. Step 5: Solve for x
   x = 1,638,403.30/1,404.98
6. Step 6: Final answer
   x = 1,166.14