Finding the Fourth Proportional to 9,978.36, 14,957.76 and 8,500.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.36 : 14,957.76 = 8,500.92 : x
2. Step 2: Convert to fraction form
   9,978.36/14,957.76 = 8,500.92/x
3. Step 3: Cross multiply
   9,978.36x = 14,957.76 × 8,500.92
4. Step 4: Simplify right side
   9,978.36x = 127,154,721.14
5. Step 5: Solve for x
   x = 127,154,721.14/9,978.36
6. Step 6: Final answer
   x = 12,743.05