Finding the Fourth Proportional to 2,886.78, 4,330.38 and 986.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,886.78 : 4,330.38 = 986.34 : x
2. Step 2: Convert to fraction form
   2,886.78/4,330.38 = 986.34/x
3. Step 3: Cross multiply
   2,886.78x = 4,330.38 × 986.34
4. Step 4: Simplify right side
   2,886.78x = 4,271,227.01
5. Step 5: Solve for x
   x = 4,271,227.01/2,886.78
6. Step 6: Final answer
   x = 1,479.58