Finding the Fourth Proportional to 2,607.76, 3,902.40 and 1,912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.76 : 3,902.40 = 1,912.72 : x
2. Step 2: Convert to fraction form
   2,607.76/3,902.40 = 1,912.72/x
3. Step 3: Cross multiply
   2,607.76x = 3,902.40 × 1,912.72
4. Step 4: Simplify right side
   2,607.76x = 7,464,198.53
5. Step 5: Solve for x
   x = 7,464,198.53/2,607.76
6. Step 6: Final answer
   x = 2,862.30