Finding the Fourth Proportional to 28,101.31, 42,154.79 and 8,111.30

Step by Step Solution

1. Step 1: Write the proportion equation
   28,101.31 : 42,154.79 = 8,111.30 : x
2. Step 2: Convert to fraction form
   28,101.31/42,154.79 = 8,111.30/x
3. Step 3: Cross multiply
   28,101.31x = 42,154.79 × 8,111.30
4. Step 4: Simplify right side
   28,101.31x = 341,929,896.80
5. Step 5: Solve for x
   x = 341,929,896.80/28,101.31
6. Step 6: Final answer
   x = 12,167.76