Finding the Fourth Proportional to 10,931.92, 16,400.32 and 3,140.14

Step by Step Solution

1. Step 1: Write the proportion equation
   10,931.92 : 16,400.32 = 3,140.14 : x
2. Step 2: Convert to fraction form
   10,931.92/16,400.32 = 3,140.14/x
3. Step 3: Cross multiply
   10,931.92x = 16,400.32 × 3,140.14
4. Step 4: Simplify right side
   10,931.92x = 51,499,300.84
5. Step 5: Solve for x
   x = 51,499,300.84/10,931.92
6. Step 6: Final answer
   x = 4,710.91