Finding the Fourth Proportional to 1,878.78, 2,814.96 and 1,330.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.78 : 2,814.96 = 1,330.05 : x
2. Step 2: Convert to fraction form
   1,878.78/2,814.96 = 1,330.05/x
3. Step 3: Cross multiply
   1,878.78x = 2,814.96 × 1,330.05
4. Step 4: Simplify right side
   1,878.78x = 3,744,037.55
5. Step 5: Solve for x
   x = 3,744,037.55/1,878.78
6. Step 6: Final answer
   x = 1,992.80