Finding the Fourth Proportional to 21,856.47, 32,776.38 and 7,813.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,856.47 : 32,776.38 = 7,813.91 : x
2. Step 2: Convert to fraction form
   21,856.47/32,776.38 = 7,813.91/x
3. Step 3: Cross multiply
   21,856.47x = 32,776.38 × 7,813.91
4. Step 4: Simplify right side
   21,856.47x = 256,111,519.56
5. Step 5: Solve for x
   x = 256,111,519.56/21,856.47
6. Step 6: Final answer
   x = 11,717.88