Finding the Fourth Proportional to 1,085.40, 1,626.72 and 591.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.40 : 1,626.72 = 591.48 : x
2. Step 2: Convert to fraction form
   1,085.40/1,626.72 = 591.48/x
3. Step 3: Cross multiply
   1,085.40x = 1,626.72 × 591.48
4. Step 4: Simplify right side
   1,085.40x = 962,172.35
5. Step 5: Solve for x
   x = 962,172.35/1,085.40
6. Step 6: Final answer
   x = 886.47