Finding the Fourth Proportional to 9,301.50, 12,798.41 and 8,978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,301.50 : 12,798.41 = 8,978.31 : x
2. Step 2: Convert to fraction form
   9,301.50/12,798.41 = 8,978.31/x
3. Step 3: Cross multiply
   9,301.50x = 12,798.41 × 8,978.31
4. Step 4: Simplify right side
   9,301.50x = 114,908,047.60
5. Step 5: Solve for x
   x = 114,908,047.60/9,301.50
6. Step 6: Final answer
   x = 12,353.71