Finding the Fourth Proportional to 15,529.60, 21,429.60 and 8,813.99

Step by Step Solution

1. Step 1: Write the proportion equation
   15,529.60 : 21,429.60 = 8,813.99 : x
2. Step 2: Convert to fraction form
   15,529.60/21,429.60 = 8,813.99/x
3. Step 3: Cross multiply
   15,529.60x = 21,429.60 × 8,813.99
4. Step 4: Simplify right side
   15,529.60x = 188,880,300.63
5. Step 5: Solve for x
   x = 188,880,300.63/15,529.60
6. Step 6: Final answer
   x = 12,162.60