Finding the Fourth Proportional to 8,345.82, 12,521.56 and 7,186.70

Step by Step Solution

1. Step 1: Write the proportion equation
   8,345.82 : 12,521.56 = 7,186.70 : x
2. Step 2: Convert to fraction form
   8,345.82/12,521.56 = 7,186.70/x
3. Step 3: Cross multiply
   8,345.82x = 12,521.56 × 7,186.70
4. Step 4: Simplify right side
   8,345.82x = 89,988,695.25
5. Step 5: Solve for x
   x = 89,988,695.25/8,345.82
6. Step 6: Final answer
   x = 10,782.49