Finding the Fourth Proportional to 2,500.78, 3,450.81 and 1,381.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.78 : 3,450.81 = 1,381.72 : x
2. Step 2: Convert to fraction form
   2,500.78/3,450.81 = 1,381.72/x
3. Step 3: Cross multiply
   2,500.78x = 3,450.81 × 1,381.72
4. Step 4: Simplify right side
   2,500.78x = 4,768,053.19
5. Step 5: Solve for x
   x = 4,768,053.19/2,500.78
6. Step 6: Final answer
   x = 1,906.63