Finding the Fourth Proportional to 1,339.50, 1,848.51 and 815.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.50 : 1,848.51 = 815.43 : x
2. Step 2: Convert to fraction form
   1,339.50/1,848.51 = 815.43/x
3. Step 3: Cross multiply
   1,339.50x = 1,848.51 × 815.43
4. Step 4: Simplify right side
   1,339.50x = 1,507,330.51
5. Step 5: Solve for x
   x = 1,507,330.51/1,339.50
6. Step 6: Final answer
   x = 1,125.29