Finding the Fourth Proportional to 9,405.82, 12,980.56 and 5,213.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.82 : 12,980.56 = 5,213.98 : x
2. Step 2: Convert to fraction form
   9,405.82/12,980.56 = 5,213.98/x
3. Step 3: Cross multiply
   9,405.82x = 12,980.56 × 5,213.98
4. Step 4: Simplify right side
   9,405.82x = 67,680,380.23
5. Step 5: Solve for x
   x = 67,680,380.23/9,405.82
6. Step 6: Final answer
   x = 7,195.59