Finding the Fourth Proportional to 2,086.65, 3,125.72 and 987.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.65 : 3,125.72 = 987.68 : x
2. Step 2: Convert to fraction form
   2,086.65/3,125.72 = 987.68/x
3. Step 3: Cross multiply
   2,086.65x = 3,125.72 × 987.68
4. Step 4: Simplify right side
   2,086.65x = 3,087,190.56
5. Step 5: Solve for x
   x = 3,087,190.56/2,086.65
6. Step 6: Final answer
   x = 1,479.50