Finding the Fourth Proportional to 1,085.87, 1,631.00 and 958.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.87 : 1,631.00 = 958.74 : x
2. Step 2: Convert to fraction form
   1,085.87/1,631.00 = 958.74/x
3. Step 3: Cross multiply
   1,085.87x = 1,631.00 × 958.74
4. Step 4: Simplify right side
   1,085.87x = 1,563,700.15
5. Step 5: Solve for x
   x = 1,563,700.15/1,085.87
6. Step 6: Final answer
   x = 1,440.05