Finding the Fourth Proportional to 1,503.42, 2,074.55 and 840.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,503.42 : 2,074.55 = 840.25 : x
2. Step 2: Convert to fraction form
   1,503.42/2,074.55 = 840.25/x
3. Step 3: Cross multiply
   1,503.42x = 2,074.55 × 840.25
4. Step 4: Simplify right side
   1,503.42x = 1,743,140.64
5. Step 5: Solve for x
   x = 1,743,140.64/1,503.42
6. Step 6: Final answer
   x = 1,159.45