Finding the Fourth Proportional to 1,558.63, 2,339.31 and 1,315.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.63 : 2,339.31 = 1,315.33 : x
2. Step 2: Convert to fraction form
   1,558.63/2,339.31 = 1,315.33/x
3. Step 3: Cross multiply
   1,558.63x = 2,339.31 × 1,315.33
4. Step 4: Simplify right side
   1,558.63x = 3,076,964.62
5. Step 5: Solve for x
   x = 3,076,964.62/1,558.63
6. Step 6: Final answer
   x = 1,974.15