Finding the Fourth Proportional to 1,439.15, 1,985.49 and 942.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.15 : 1,985.49 = 942.06 : x
2. Step 2: Convert to fraction form
   1,439.15/1,985.49 = 942.06/x
3. Step 3: Cross multiply
   1,439.15x = 1,985.49 × 942.06
4. Step 4: Simplify right side
   1,439.15x = 1,870,450.71
5. Step 5: Solve for x
   x = 1,870,450.71/1,439.15
6. Step 6: Final answer
   x = 1,299.70