Finding the Fourth Proportional to 1,390.62, 1,916.79 and 942.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.62 : 1,916.79 = 942.33 : x
2. Step 2: Convert to fraction form
   1,390.62/1,916.79 = 942.33/x
3. Step 3: Cross multiply
   1,390.62x = 1,916.79 × 942.33
4. Step 4: Simplify right side
   1,390.62x = 1,806,248.72
5. Step 5: Solve for x
   x = 1,806,248.72/1,390.62
6. Step 6: Final answer
   x = 1,298.88