Finding the Fourth Proportional to 10,057.96, 15,090.54 and 5,128.84

Step by Step Solution

1. Step 1: Write the proportion equation
   10,057.96 : 15,090.54 = 5,128.84 : x
2. Step 2: Convert to fraction form
   10,057.96/15,090.54 = 5,128.84/x
3. Step 3: Cross multiply
   10,057.96x = 15,090.54 × 5,128.84
4. Step 4: Simplify right side
   10,057.96x = 77,396,965.17
5. Step 5: Solve for x
   x = 77,396,965.17/10,057.96
6. Step 6: Final answer
   x = 7,695.10