Finding the Fourth Proportional to 8,460.62, 12,705.45 and 5,192.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,460.62 : 12,705.45 = 5,192.90 : x
2. Step 2: Convert to fraction form
   8,460.62/12,705.45 = 5,192.90/x
3. Step 3: Cross multiply
   8,460.62x = 12,705.45 × 5,192.90
4. Step 4: Simplify right side
   8,460.62x = 65,978,131.31
5. Step 5: Solve for x
   x = 65,978,131.31/8,460.62
6. Step 6: Final answer
   x = 7,798.26