Finding the Fourth Proportional to 1,354.10, 1,866.78 and 856.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.10 : 1,866.78 = 856.49 : x
2. Step 2: Convert to fraction form
   1,354.10/1,866.78 = 856.49/x
3. Step 3: Cross multiply
   1,354.10x = 1,866.78 × 856.49
4. Step 4: Simplify right side
   1,354.10x = 1,598,869.07
5. Step 5: Solve for x
   x = 1,598,869.07/1,354.10
6. Step 6: Final answer
   x = 1,180.77