Finding the Fourth Proportional to 1,582.31, 2,180.50 and 1,139.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,582.31 : 2,180.50 = 1,139.37 : x
2. Step 2: Convert to fraction form
   1,582.31/2,180.50 = 1,139.37/x
3. Step 3: Cross multiply
   1,582.31x = 2,180.50 × 1,139.37
4. Step 4: Simplify right side
   1,582.31x = 2,484,393.44
5. Step 5: Solve for x
   x = 2,484,393.44/1,582.31
6. Step 6: Final answer
   x = 1,570.11