Finding the Fourth Proportional to 8,519.34, 12,780.18 and 2,971.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,519.34 : 12,780.18 = 2,971.86 : x
2. Step 2: Convert to fraction form
   8,519.34/12,780.18 = 2,971.86/x
3. Step 3: Cross multiply
   8,519.34x = 12,780.18 × 2,971.86
4. Step 4: Simplify right side
   8,519.34x = 37,980,857.81
5. Step 5: Solve for x
   x = 37,980,857.81/8,519.34
6. Step 6: Final answer
   x = 4,458.19