Finding the Fourth Proportional to 7,897.30, 10,864.74 and 7,678.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,897.30 : 10,864.74 = 7,678.60 : x
2. Step 2: Convert to fraction form
   7,897.30/10,864.74 = 7,678.60/x
3. Step 3: Cross multiply
   7,897.30x = 10,864.74 × 7,678.60
4. Step 4: Simplify right side
   7,897.30x = 83,425,992.56
5. Step 5: Solve for x
   x = 83,425,992.56/7,897.30
6. Step 6: Final answer
   x = 10,563.86