Finding the Fourth Proportional to 1,339.68, 1,848.24 and 815.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.68 : 1,848.24 = 815.52 : x
2. Step 2: Convert to fraction form
   1,339.68/1,848.24 = 815.52/x
3. Step 3: Cross multiply
   1,339.68x = 1,848.24 × 815.52
4. Step 4: Simplify right side
   1,339.68x = 1,507,276.68
5. Step 5: Solve for x
   x = 1,507,276.68/1,339.68
6. Step 6: Final answer
   x = 1,125.10