Finding the Fourth Proportional to 1,160.37, 1,590.93 and 1,139.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.37 : 1,590.93 = 1,139.58 : x
2. Step 2: Convert to fraction form
   1,160.37/1,590.93 = 1,139.58/x
3. Step 3: Cross multiply
   1,160.37x = 1,590.93 × 1,139.58
4. Step 4: Simplify right side
   1,160.37x = 1,812,992.01
5. Step 5: Solve for x
   x = 1,812,992.01/1,160.37
6. Step 6: Final answer
   x = 1,562.43