Finding the Fourth Proportional to 1,586.74, 2,190.72 and 1,089.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,586.74 : 2,190.72 = 1,089.22 : x
2. Step 2: Convert to fraction form
   1,586.74/2,190.72 = 1,089.22/x
3. Step 3: Cross multiply
   1,586.74x = 2,190.72 × 1,089.22
4. Step 4: Simplify right side
   1,586.74x = 2,386,176.04
5. Step 5: Solve for x
   x = 2,386,176.04/1,586.74
6. Step 6: Final answer
   x = 1,503.82