Finding the Fourth Proportional to 1,585.89, 2,189.60 and 988.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,585.89 : 2,189.60 = 988.62 : x
2. Step 2: Convert to fraction form
   1,585.89/2,189.60 = 988.62/x
3. Step 3: Cross multiply
   1,585.89x = 2,189.60 × 988.62
4. Step 4: Simplify right side
   1,585.89x = 2,164,682.35
5. Step 5: Solve for x
   x = 2,164,682.35/1,585.89
6. Step 6: Final answer
   x = 1,364.96