Finding the Fourth Proportional to 9,379.90, 12,942.39 and 5,187.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,379.90 : 12,942.39 = 5,187.34 : x
2. Step 2: Convert to fraction form
   9,379.90/12,942.39 = 5,187.34/x
3. Step 3: Cross multiply
   9,379.90x = 12,942.39 × 5,187.34
4. Step 4: Simplify right side
   9,379.90x = 67,136,577.34
5. Step 5: Solve for x
   x = 67,136,577.34/9,379.90
6. Step 6: Final answer
   x = 7,157.49