Finding the Fourth Proportional to 2,615.24, 3,921.78 and 1,298.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.24 : 3,921.78 = 1,298.51 : x
2. Step 2: Convert to fraction form
   2,615.24/3,921.78 = 1,298.51/x
3. Step 3: Cross multiply
   2,615.24x = 3,921.78 × 1,298.51
4. Step 4: Simplify right side
   2,615.24x = 5,092,492.58
5. Step 5: Solve for x
   x = 5,092,492.58/2,615.24
6. Step 6: Final answer
   x = 1,947.24