Finding the Fourth Proportional to 2,451.09, 3,381.76 and 1,388.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,451.09 : 3,381.76 = 1,388.69 : x
2. Step 2: Convert to fraction form
   2,451.09/3,381.76 = 1,388.69/x
3. Step 3: Cross multiply
   2,451.09x = 3,381.76 × 1,388.69
4. Step 4: Simplify right side
   2,451.09x = 4,696,213.80
5. Step 5: Solve for x
   x = 4,696,213.80/2,451.09
6. Step 6: Final answer
   x = 1,915.97