Finding the Fourth Proportional to 2,140.32, 3,210.89 and 986.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.32 : 3,210.89 = 986.07 : x
2. Step 2: Convert to fraction form
   2,140.32/3,210.89 = 986.07/x
3. Step 3: Cross multiply
   2,140.32x = 3,210.89 × 986.07
4. Step 4: Simplify right side
   2,140.32x = 3,166,157.37
5. Step 5: Solve for x
   x = 3,166,157.37/2,140.32
6. Step 6: Final answer
   x = 1,479.29