Finding the Fourth Proportional to 11,644.76, 16,058.70 and 7,664.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,644.76 : 16,058.70 = 7,664.12 : x
2. Step 2: Convert to fraction form
   11,644.76/16,058.70 = 7,664.12/x
3. Step 3: Cross multiply
   11,644.76x = 16,058.70 × 7,664.12
4. Step 4: Simplify right side
   11,644.76x = 123,075,803.84
5. Step 5: Solve for x
   x = 123,075,803.84/11,644.76
6. Step 6: Final answer
   x = 10,569.20