Finding the Fourth Proportional to 2,156.79, 3,234.73 and 986.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.79 : 3,234.73 = 986.46 : x
2. Step 2: Convert to fraction form
   2,156.79/3,234.73 = 986.46/x
3. Step 3: Cross multiply
   2,156.79x = 3,234.73 × 986.46
4. Step 4: Simplify right side
   2,156.79x = 3,190,931.76
5. Step 5: Solve for x
   x = 3,190,931.76/2,156.79
6. Step 6: Final answer
   x = 1,479.48