Finding the Fourth Proportional to 12,428.11, 17,152.71 and 7,962.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,428.11 : 17,152.71 = 7,962.51 : x
2. Step 2: Convert to fraction form
   12,428.11/17,152.71 = 7,962.51/x
3. Step 3: Cross multiply
   12,428.11x = 17,152.71 × 7,962.51
4. Step 4: Simplify right side
   12,428.11x = 136,578,624.90
5. Step 5: Solve for x
   x = 136,578,624.90/12,428.11
6. Step 6: Final answer
   x = 10,989.49