Finding the Fourth Proportional to 15,443.08, 21,291.54 and 12,607.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,443.08 : 21,291.54 = 12,607.72 : x
2. Step 2: Convert to fraction form
   15,443.08/21,291.54 = 12,607.72/x
3. Step 3: Cross multiply
   15,443.08x = 21,291.54 × 12,607.72
4. Step 4: Simplify right side
   15,443.08x = 268,437,774.69
5. Step 5: Solve for x
   x = 268,437,774.69/15,443.08
6. Step 6: Final answer
   x = 17,382.40