Finding the Fourth Proportional to 12,358.58, 17,058.06 and 7,640.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,358.58 : 17,058.06 = 7,640.19 : x
2. Step 2: Convert to fraction form
   12,358.58/17,058.06 = 7,640.19/x
3. Step 3: Cross multiply
   12,358.58x = 17,058.06 × 7,640.19
4. Step 4: Simplify right side
   12,358.58x = 130,326,819.43
5. Step 5: Solve for x
   x = 130,326,819.43/12,358.58
6. Step 6: Final answer
   x = 10,545.46