Finding the Fourth Proportional to 12,897.87, 17,802.23 and 7,864.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,897.87 : 17,802.23 = 7,864.86 : x
2. Step 2: Convert to fraction form
   12,897.87/17,802.23 = 7,864.86/x
3. Step 3: Cross multiply
   12,897.87x = 17,802.23 × 7,864.86
4. Step 4: Simplify right side
   12,897.87x = 140,012,074.07
5. Step 5: Solve for x
   x = 140,012,074.07/12,897.87
6. Step 6: Final answer
   x = 10,855.44