Finding the Fourth Proportional to 11,812.80, 16,298.72 and 7,616

Step by Step Solution

1. Step 1: Write the proportion equation
   11,812.80 : 16,298.72 = 7,616 : x
2. Step 2: Convert to fraction form
   11,812.80/16,298.72 = 7,616/x
3. Step 3: Cross multiply
   11,812.80x = 16,298.72 × 7,616
4. Step 4: Simplify right side
   11,812.80x = 124,131,051.52
5. Step 5: Solve for x
   x = 124,131,051.52/11,812.80
6. Step 6: Final answer
   x = 10,508.18