Finding the Fourth Proportional to 15,429.57, 21,292.82 and 8,355.99

Step by Step Solution

1. Step 1: Write the proportion equation
   15,429.57 : 21,292.82 = 8,355.99 : x
2. Step 2: Convert to fraction form
   15,429.57/21,292.82 = 8,355.99/x
3. Step 3: Cross multiply
   15,429.57x = 21,292.82 × 8,355.99
4. Step 4: Simplify right side
   15,429.57x = 177,922,549.21
5. Step 5: Solve for x
   x = 177,922,549.21/15,429.57
6. Step 6: Final answer
   x = 11,531.27