Finding the Fourth Proportional to 12,721.92, 17,557.34 and 7,058.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.92 : 17,557.34 = 7,058.50 : x
2. Step 2: Convert to fraction form
   12,721.92/17,557.34 = 7,058.50/x
3. Step 3: Cross multiply
   12,721.92x = 17,557.34 × 7,058.50
4. Step 4: Simplify right side
   12,721.92x = 123,928,484.39
5. Step 5: Solve for x
   x = 123,928,484.39/12,721.92
6. Step 6: Final answer
   x = 9,741.33