Finding the Fourth Proportional to 1,555.56, 2,147.04 and 892.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.56 : 2,147.04 = 892.40 : x
2. Step 2: Convert to fraction form
   1,555.56/2,147.04 = 892.40/x
3. Step 3: Cross multiply
   1,555.56x = 2,147.04 × 892.40
4. Step 4: Simplify right side
   1,555.56x = 1,916,018.50
5. Step 5: Solve for x
   x = 1,916,018.50/1,555.56
6. Step 6: Final answer
   x = 1,231.72