Finding the Fourth Proportional to 1,602.38, 2,211.40 and 939.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,602.38 : 2,211.40 = 939.30 : x
2. Step 2: Convert to fraction form
   1,602.38/2,211.40 = 939.30/x
3. Step 3: Cross multiply
   1,602.38x = 2,211.40 × 939.30
4. Step 4: Simplify right side
   1,602.38x = 2,077,160.90
5. Step 5: Solve for x
   x = 2,077,160.90/1,602.38
6. Step 6: Final answer
   x = 1,296.30