Finding the Fourth Proportional to 10,431.19, 14,394.88 and 5,715.51

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431.19 : 14,394.88 = 5,715.51 : x
2. Step 2: Convert to fraction form
   10,431.19/14,394.88 = 5,715.51/x
3. Step 3: Cross multiply
   10,431.19x = 14,394.88 × 5,715.51
4. Step 4: Simplify right side
   10,431.19x = 82,274,080.59
5. Step 5: Solve for x
   x = 82,274,080.59/10,431.19
6. Step 6: Final answer
   x = 7,887.31