Finding the Fourth Proportional to 10,066.80, 15,103.84 and 5,138.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,066.80 : 15,103.84 = 5,138.76 : x
2. Step 2: Convert to fraction form
   10,066.80/15,103.84 = 5,138.76/x
3. Step 3: Cross multiply
   10,066.80x = 15,103.84 × 5,138.76
4. Step 4: Simplify right side
   10,066.80x = 77,615,008.84
5. Step 5: Solve for x
   x = 77,615,008.84/10,066.80
6. Step 6: Final answer
   x = 7,710.00