Finding the Fourth Proportional to 1,339.47, 1,848.87 and 842.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.47 : 1,848.87 = 842.10 : x
2. Step 2: Convert to fraction form
   1,339.47/1,848.87 = 842.10/x
3. Step 3: Cross multiply
   1,339.47x = 1,848.87 × 842.10
4. Step 4: Simplify right side
   1,339.47x = 1,556,933.43
5. Step 5: Solve for x
   x = 1,556,933.43/1,339.47
6. Step 6: Final answer
   x = 1,162.35