Finding the Fourth Proportional to 10,931.50, 16,400.02 and 3,140.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,931.50 : 16,400.02 = 3,140.31 : x
2. Step 2: Convert to fraction form
   10,931.50/16,400.02 = 3,140.31/x
3. Step 3: Cross multiply
   10,931.50x = 16,400.02 × 3,140.31
4. Step 4: Simplify right side
   10,931.50x = 51,501,146.81
5. Step 5: Solve for x
   x = 51,501,146.81/10,931.50
6. Step 6: Final answer
   x = 4,711.26