Finding the Fourth Proportional to 12,976.23, 17,907.86 and 7,938.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.23 : 17,907.86 = 7,938.87 : x
2. Step 2: Convert to fraction form
   12,976.23/17,907.86 = 7,938.87/x
3. Step 3: Cross multiply
   12,976.23x = 17,907.86 × 7,938.87
4. Step 4: Simplify right side
   12,976.23x = 142,168,172.52
5. Step 5: Solve for x
   x = 142,168,172.52/12,976.23
6. Step 6: Final answer
   x = 10,956.05