Finding the Fourth Proportional to 1,339.52, 1,848.30 and 815.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.52 : 1,848.30 = 815.36 : x
2. Step 2: Convert to fraction form
   1,339.52/1,848.30 = 815.36/x
3. Step 3: Cross multiply
   1,339.52x = 1,848.30 × 815.36
4. Step 4: Simplify right side
   1,339.52x = 1,507,029.89
5. Step 5: Solve for x
   x = 1,507,029.89/1,339.52
6. Step 6: Final answer
   x = 1,125.05