Finding the Fourth Proportional to 1,878.12, 2,815.56 and 1,107

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.12 : 2,815.56 = 1,107 : x
2. Step 2: Convert to fraction form
   1,878.12/2,815.56 = 1,107/x
3. Step 3: Cross multiply
   1,878.12x = 2,815.56 × 1,107
4. Step 4: Simplify right side
   1,878.12x = 3,116,824.92
5. Step 5: Solve for x
   x = 3,116,824.92/1,878.12
6. Step 6: Final answer
   x = 1,659.55