Finding the Fourth Proportional to 11,628, 17,445.36 and 3,420

Step by Step Solution

1. Step 1: Write the proportion equation
   11,628 : 17,445.36 = 3,420 : x
2. Step 2: Convert to fraction form
   11,628/17,445.36 = 3,420/x
3. Step 3: Cross multiply
   11,628x = 17,445.36 × 3,420
4. Step 4: Simplify right side
   11,628x = 59,663,131.20
5. Step 5: Solve for x
   x = 59,663,131.20/11,628
6. Step 6: Final answer
   x = 5,130.99