Finding the Fourth Proportional to 10,751.60, 16,123.30 and 5,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,751.60 : 16,123.30 = 5,128.28 : x
2. Step 2: Convert to fraction form
   10,751.60/16,123.30 = 5,128.28/x
3. Step 3: Cross multiply
   10,751.60x = 16,123.30 × 5,128.28
4. Step 4: Simplify right side
   10,751.60x = 82,684,690.67
5. Step 5: Solve for x
   x = 82,684,690.67/10,751.60
6. Step 6: Final answer
   x = 7,690.45