Finding the Fourth Proportional to 2,521.52, 3,479.78 and 1,387.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.52 : 3,479.78 = 1,387.23 : x
2. Step 2: Convert to fraction form
   2,521.52/3,479.78 = 1,387.23/x
3. Step 3: Cross multiply
   2,521.52x = 3,479.78 × 1,387.23
4. Step 4: Simplify right side
   2,521.52x = 4,827,248.27
5. Step 5: Solve for x
   x = 4,827,248.27/2,521.52
6. Step 6: Final answer
   x = 1,914.42