Finding the Fourth Proportional to 1,554.67, 2,145.45 and 856.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.67 : 2,145.45 = 856.05 : x
2. Step 2: Convert to fraction form
   1,554.67/2,145.45 = 856.05/x
3. Step 3: Cross multiply
   1,554.67x = 2,145.45 × 856.05
4. Step 4: Simplify right side
   1,554.67x = 1,836,612.47
5. Step 5: Solve for x
   x = 1,836,612.47/1,554.67
6. Step 6: Final answer
   x = 1,181.35