Finding the Fourth Proportional to 2,386.86, 3,293.80 and 1,392.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.86 : 3,293.80 = 1,392.07 : x
2. Step 2: Convert to fraction form
   2,386.86/3,293.80 = 1,392.07/x
3. Step 3: Cross multiply
   2,386.86x = 3,293.80 × 1,392.07
4. Step 4: Simplify right side
   2,386.86x = 4,585,188.45
5. Step 5: Solve for x
   x = 4,585,188.45/2,386.86
6. Step 6: Final answer
   x = 1,921.01