Finding the Fourth Proportional to 1,554.75, 2,145.56 and 856.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.75 : 2,145.56 = 856.17 : x
2. Step 2: Convert to fraction form
   1,554.75/2,145.56 = 856.17/x
3. Step 3: Cross multiply
   1,554.75x = 2,145.56 × 856.17
4. Step 4: Simplify right side
   1,554.75x = 1,836,959.82
5. Step 5: Solve for x
   x = 1,836,959.82/1,554.75
6. Step 6: Final answer
   x = 1,181.51