Finding the Fourth Proportional to 2,136.17, 2,945.88 and 1,389.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,136.17 : 2,945.88 = 1,389.27 : x
2. Step 2: Convert to fraction form
   2,136.17/2,945.88 = 1,389.27/x
3. Step 3: Cross multiply
   2,136.17x = 2,945.88 × 1,389.27
4. Step 4: Simplify right side
   2,136.17x = 4,092,622.71
5. Step 5: Solve for x
   x = 4,092,622.71/2,136.17
6. Step 6: Final answer
   x = 1,915.87