Finding the Fourth Proportional to 1,379.46, 1,902.96 and 986.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.46 : 1,902.96 = 986.72 : x
2. Step 2: Convert to fraction form
   1,379.46/1,902.96 = 986.72/x
3. Step 3: Cross multiply
   1,379.46x = 1,902.96 × 986.72
4. Step 4: Simplify right side
   1,379.46x = 1,877,688.69
5. Step 5: Solve for x
   x = 1,877,688.69/1,379.46
6. Step 6: Final answer
   x = 1,361.18