Finding the Fourth Proportional to 1,380.78, 2,056.28 and 1,372.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.78 : 2,056.28 = 1,372.86 : x
2. Step 2: Convert to fraction form
   1,380.78/2,056.28 = 1,372.86/x
3. Step 3: Cross multiply
   1,380.78x = 2,056.28 × 1,372.86
4. Step 4: Simplify right side
   1,380.78x = 2,822,977.70
5. Step 5: Solve for x
   x = 2,822,977.70/1,380.78
6. Step 6: Final answer
   x = 2,044.48