Finding the Fourth Proportional to 13,428.18, 18,526.32 and 7,761.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,428.18 : 18,526.32 = 7,761.42 : x
2. Step 2: Convert to fraction form
   13,428.18/18,526.32 = 7,761.42/x
3. Step 3: Cross multiply
   13,428.18x = 18,526.32 × 7,761.42
4. Step 4: Simplify right side
   13,428.18x = 143,790,550.57
5. Step 5: Solve for x
   x = 143,790,550.57/13,428.18
6. Step 6: Final answer
   x = 10,708.12