Finding the Fourth Proportional to 2,136.38, 2,946.69 and 1,388.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,136.38 : 2,946.69 = 1,388.96 : x
2. Step 2: Convert to fraction form
   2,136.38/2,946.69 = 1,388.96/x
3. Step 3: Cross multiply
   2,136.38x = 2,946.69 × 1,388.96
4. Step 4: Simplify right side
   2,136.38x = 4,092,834.54
5. Step 5: Solve for x
   x = 4,092,834.54/2,136.38
6. Step 6: Final answer
   x = 1,915.78