Finding the Fourth Proportional to 1,564.39, 2,342.61 and 939.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,564.39 : 2,342.61 = 939.30 : x
2. Step 2: Convert to fraction form
   1,564.39/2,342.61 = 939.30/x
3. Step 3: Cross multiply
   1,564.39x = 2,342.61 × 939.30
4. Step 4: Simplify right side
   1,564.39x = 2,200,404.79
5. Step 5: Solve for x
   x = 2,200,404.79/1,564.39
6. Step 6: Final answer
   x = 1,406.56