Finding the Fourth Proportional to 15,480.15, 21,362.54 and 8,406.51

Step by Step Solution

1. Step 1: Write the proportion equation
   15,480.15 : 21,362.54 = 8,406.51 : x
2. Step 2: Convert to fraction form
   15,480.15/21,362.54 = 8,406.51/x
3. Step 3: Cross multiply
   15,480.15x = 21,362.54 × 8,406.51
4. Step 4: Simplify right side
   15,480.15x = 179,584,364.10
5. Step 5: Solve for x
   x = 179,584,364.10/15,480.15
6. Step 6: Final answer
   x = 11,600.94