Finding the Fourth Proportional to 1,405.38, 1,939.43 and 784.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.38 : 1,939.43 = 784.38 : x
2. Step 2: Convert to fraction form
   1,405.38/1,939.43 = 784.38/x
3. Step 3: Cross multiply
   1,405.38x = 1,939.43 × 784.38
4. Step 4: Simplify right side
   1,405.38x = 1,521,250.10
5. Step 5: Solve for x
   x = 1,521,250.10/1,405.38
6. Step 6: Final answer
   x = 1,082.45