Finding the Fourth Proportional to 10,117.27, 15,256.87 and 9,978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,117.27 : 15,256.87 = 9,978.76 : x
2. Step 2: Convert to fraction form
   10,117.27/15,256.87 = 9,978.76/x
3. Step 3: Cross multiply
   10,117.27x = 15,256.87 × 9,978.76
4. Step 4: Simplify right side
   10,117.27x = 152,244,644.08
5. Step 5: Solve for x
   x = 152,244,644.08/10,117.27
6. Step 6: Final answer
   x = 15,048.00