Finding the Fourth Proportional to 12,964.32, 17,865.90 and 8,978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,964.32 : 17,865.90 = 8,978.04 : x
2. Step 2: Convert to fraction form
   12,964.32/17,865.90 = 8,978.04/x
3. Step 3: Cross multiply
   12,964.32x = 17,865.90 × 8,978.04
4. Step 4: Simplify right side
   12,964.32x = 160,400,764.84
5. Step 5: Solve for x
   x = 160,400,764.84/12,964.32
6. Step 6: Final answer
   x = 12,372.48