Finding the Fourth Proportional to 1,554.93, 2,145.78 and 856.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.93 : 2,145.78 = 856.31 : x
2. Step 2: Convert to fraction form
   1,554.93/2,145.78 = 856.31/x
3. Step 3: Cross multiply
   1,554.93x = 2,145.78 × 856.31
4. Step 4: Simplify right side
   1,554.93x = 1,837,442.14
5. Step 5: Solve for x
   x = 1,837,442.14/1,554.93
6. Step 6: Final answer
   x = 1,181.69