Finding the Fourth Proportional to 10,431, 14,394.78 and 5,715.45

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431 : 14,394.78 = 5,715.45 : x
2. Step 2: Convert to fraction form
   10,431/14,394.78 = 5,715.45/x
3. Step 3: Cross multiply
   10,431x = 14,394.78 × 5,715.45
4. Step 4: Simplify right side
   10,431x = 82,272,645.35
5. Step 5: Solve for x
   x = 82,272,645.35/10,431
6. Step 6: Final answer
   x = 7,887.32