Finding the Fourth Proportional to 2,085.39, 3,123.84 and 986.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.39 : 3,123.84 = 986.43 : x
2. Step 2: Convert to fraction form
   2,085.39/3,123.84 = 986.43/x
3. Step 3: Cross multiply
   2,085.39x = 3,123.84 × 986.43
4. Step 4: Simplify right side
   2,085.39x = 3,081,428.94
5. Step 5: Solve for x
   x = 3,081,428.94/2,085.39
6. Step 6: Final answer
   x = 1,477.63