Finding the Fourth Proportional to 1,554.78, 2,145.50 and 856.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.78 : 2,145.50 = 856.16 : x
2. Step 2: Convert to fraction form
   1,554.78/2,145.50 = 856.16/x
3. Step 3: Cross multiply
   1,554.78x = 2,145.50 × 856.16
4. Step 4: Simplify right side
   1,554.78x = 1,836,892.34
5. Step 5: Solve for x
   x = 1,836,892.34/1,554.78
6. Step 6: Final answer
   x = 1,181.45