Finding the Fourth Proportional to 11,478.38, 17,215.30 and 3,156.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,478.38 : 17,215.30 = 3,156.25 : x
2. Step 2: Convert to fraction form
   11,478.38/17,215.30 = 3,156.25/x
3. Step 3: Cross multiply
   11,478.38x = 17,215.30 × 3,156.25
4. Step 4: Simplify right side
   11,478.38x = 54,335,790.63
5. Step 5: Solve for x
   x = 54,335,790.63/11,478.38
6. Step 6: Final answer
   x = 4,733.75