Finding the Fourth Proportional to 1,503.47, 2,074.72 and 840.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,503.47 : 2,074.72 = 840.31 : x
2. Step 2: Convert to fraction form
   1,503.47/2,074.72 = 840.31/x
3. Step 3: Cross multiply
   1,503.47x = 2,074.72 × 840.31
4. Step 4: Simplify right side
   1,503.47x = 1,743,407.96
5. Step 5: Solve for x
   x = 1,743,407.96/1,503.47
6. Step 6: Final answer
   x = 1,159.59