Finding the Fourth Proportional to 8,100.77, 11,156.71 and 6,981.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,100.77 : 11,156.71 = 6,981.30 : x
2. Step 2: Convert to fraction form
   8,100.77/11,156.71 = 6,981.30/x
3. Step 3: Cross multiply
   8,100.77x = 11,156.71 × 6,981.30
4. Step 4: Simplify right side
   8,100.77x = 77,888,339.52
5. Step 5: Solve for x
   x = 77,888,339.52/8,100.77
6. Step 6: Final answer
   x = 9,614.93