Finding the Fourth Proportional to 2,521.07, 3,479.16 and 1,386.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.07 : 3,479.16 = 1,386.79 : x
2. Step 2: Convert to fraction form
   2,521.07/3,479.16 = 1,386.79/x
3. Step 3: Cross multiply
   2,521.07x = 3,479.16 × 1,386.79
4. Step 4: Simplify right side
   2,521.07x = 4,824,843.71
5. Step 5: Solve for x
   x = 4,824,843.71/2,521.07
6. Step 6: Final answer
   x = 1,913.81