Finding the Fourth Proportional to 1,554.94, 2,145.82 and 856.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.94 : 2,145.82 = 856.31 : x
2. Step 2: Convert to fraction form
   1,554.94/2,145.82 = 856.31/x
3. Step 3: Cross multiply
   1,554.94x = 2,145.82 × 856.31
4. Step 4: Simplify right side
   1,554.94x = 1,837,490.35
5. Step 5: Solve for x
   x = 1,837,490.35/1,554.94
6. Step 6: Final answer
   x = 1,181.71