Finding the Fourth Proportional to 1,503.72, 2,074.86 and 840.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,503.72 : 2,074.86 = 840.51 : x
2. Step 2: Convert to fraction form
   1,503.72/2,074.86 = 840.51/x
3. Step 3: Cross multiply
   1,503.72x = 2,074.86 × 840.51
4. Step 4: Simplify right side
   1,503.72x = 1,743,940.58
5. Step 5: Solve for x
   x = 1,743,940.58/1,503.72
6. Step 6: Final answer
   x = 1,159.75