Finding the Fourth Proportional to 10,100.64, 15,139.76 and 4,261.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,100.64 : 15,139.76 = 4,261.28 : x
2. Step 2: Convert to fraction form
   10,100.64/15,139.76 = 4,261.28/x
3. Step 3: Cross multiply
   10,100.64x = 15,139.76 × 4,261.28
4. Step 4: Simplify right side
   10,100.64x = 64,514,756.49
5. Step 5: Solve for x
   x = 64,514,756.49/10,100.64
6. Step 6: Final answer
   x = 6,387.19