Finding the Fourth Proportional to 1,346.42, 1,858.24 and 815.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.42 : 1,858.24 = 815.36 : x
2. Step 2: Convert to fraction form
   1,346.42/1,858.24 = 815.36/x
3. Step 3: Cross multiply
   1,346.42x = 1,858.24 × 815.36
4. Step 4: Simplify right side
   1,346.42x = 1,515,123.24
5. Step 5: Solve for x
   x = 1,515,123.24/1,346.42
6. Step 6: Final answer
   x = 1,125.30