Finding the Fourth Proportional to 11,406.72, 17,111.45 and 4,386.45

Step by Step Solution

1. Step 1: Write the proportion equation
   11,406.72 : 17,111.45 = 4,386.45 : x
2. Step 2: Convert to fraction form
   11,406.72/17,111.45 = 4,386.45/x
3. Step 3: Cross multiply
   11,406.72x = 17,111.45 × 4,386.45
4. Step 4: Simplify right side
   11,406.72x = 75,058,594.99
5. Step 5: Solve for x
   x = 75,058,594.99/11,406.72
6. Step 6: Final answer
   x = 6,580.21