Finding the Fourth Proportional to 1,357.60, 1,871.72 and 1,339.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.60 : 1,871.72 = 1,339.24 : x
2. Step 2: Convert to fraction form
   1,357.60/1,871.72 = 1,339.24/x
3. Step 3: Cross multiply
   1,357.60x = 1,871.72 × 1,339.24
4. Step 4: Simplify right side
   1,357.60x = 2,506,682.29
5. Step 5: Solve for x
   x = 2,506,682.29/1,357.60
6. Step 6: Final answer
   x = 1,846.41