Finding the Fourth Proportional to 1,588.22, 2,191.72 and 889.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,588.22 : 2,191.72 = 889.60 : x
2. Step 2: Convert to fraction form
   1,588.22/2,191.72 = 889.60/x
3. Step 3: Cross multiply
   1,588.22x = 2,191.72 × 889.60
4. Step 4: Simplify right side
   1,588.22x = 1,949,754.11
5. Step 5: Solve for x
   x = 1,949,754.11/1,588.22
6. Step 6: Final answer
   x = 1,227.63