Finding the Fourth Proportional to 2,074.95, 3,112.52 and 688.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.95 : 3,112.52 = 688.25 : x
2. Step 2: Convert to fraction form
   2,074.95/3,112.52 = 688.25/x
3. Step 3: Cross multiply
   2,074.95x = 3,112.52 × 688.25
4. Step 4: Simplify right side
   2,074.95x = 2,142,172.89
5. Step 5: Solve for x
   x = 2,142,172.89/2,074.95
6. Step 6: Final answer
   x = 1,032.40