Finding the Fourth Proportional to 2,677.60, 4,019.28 and 1,378.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,677.60 : 4,019.28 = 1,378.72 : x
2. Step 2: Convert to fraction form
   2,677.60/4,019.28 = 1,378.72/x
3. Step 3: Cross multiply
   2,677.60x = 4,019.28 × 1,378.72
4. Step 4: Simplify right side
   2,677.60x = 5,541,461.72
5. Step 5: Solve for x
   x = 5,541,461.72/2,677.60
6. Step 6: Final answer
   x = 2,069.56