Finding the Fourth Proportional to 2,084.17, 3,127.61 and 989.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.17 : 3,127.61 = 989.77 : x
2. Step 2: Convert to fraction form
   2,084.17/3,127.61 = 989.77/x
3. Step 3: Cross multiply
   2,084.17x = 3,127.61 × 989.77
4. Step 4: Simplify right side
   2,084.17x = 3,095,614.55
5. Step 5: Solve for x
   x = 3,095,614.55/2,084.17
6. Step 6: Final answer
   x = 1,485.30