Finding the Fourth Proportional to 2,102.39, 2,900.72 and 1,356.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.39 : 2,900.72 = 1,356.38 : x
2. Step 2: Convert to fraction form
   2,102.39/2,900.72 = 1,356.38/x
3. Step 3: Cross multiply
   2,102.39x = 2,900.72 × 1,356.38
4. Step 4: Simplify right side
   2,102.39x = 3,934,471.81
5. Step 5: Solve for x
   x = 3,934,471.81/2,102.39
6. Step 6: Final answer
   x = 1,871.43