Finding the Fourth Proportional to 14,128.95, 21,200.31 and 5,811.46

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.95 : 21,200.31 = 5,811.46 : x
2. Step 2: Convert to fraction form
   14,128.95/21,200.31 = 5,811.46/x
3. Step 3: Cross multiply
   14,128.95x = 21,200.31 × 5,811.46
4. Step 4: Simplify right side
   14,128.95x = 123,204,753.55
5. Step 5: Solve for x
   x = 123,204,753.55/14,128.95
6. Step 6: Final answer
   x = 8,720.02