Finding the Fourth Proportional to 1,374.56, 1,896.72 and 815.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,374.56 : 1,896.72 = 815.12 : x
2. Step 2: Convert to fraction form
   1,374.56/1,896.72 = 815.12/x
3. Step 3: Cross multiply
   1,374.56x = 1,896.72 × 815.12
4. Step 4: Simplify right side
   1,374.56x = 1,546,054.41
5. Step 5: Solve for x
   x = 1,546,054.41/1,374.56
6. Step 6: Final answer
   x = 1,124.76