Finding the Fourth Proportional to 2,273.61, 3,136.56 and 1,389.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,273.61 : 3,136.56 = 1,389.93 : x
2. Step 2: Convert to fraction form
   2,273.61/3,136.56 = 1,389.93/x
3. Step 3: Cross multiply
   2,273.61x = 3,136.56 × 1,389.93
4. Step 4: Simplify right side
   2,273.61x = 4,359,598.84
5. Step 5: Solve for x
   x = 4,359,598.84/2,273.61
6. Step 6: Final answer
   x = 1,917.48