Finding the Fourth Proportional to 10,667.40, 15,996.96 and 5,117.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,667.40 : 15,996.96 = 5,117.76 : x
2. Step 2: Convert to fraction form
   10,667.40/15,996.96 = 5,117.76/x
3. Step 3: Cross multiply
   10,667.40x = 15,996.96 × 5,117.76
4. Step 4: Simplify right side
   10,667.40x = 81,868,602.01
5. Step 5: Solve for x
   x = 81,868,602.01/10,667.40
6. Step 6: Final answer
   x = 7,674.65