Finding the Fourth Proportional to 12,840.05, 19,233.53 and 7,558.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,840.05 : 19,233.53 = 7,558.78 : x
2. Step 2: Convert to fraction form
   12,840.05/19,233.53 = 7,558.78/x
3. Step 3: Cross multiply
   12,840.05x = 19,233.53 × 7,558.78
4. Step 4: Simplify right side
   12,840.05x = 145,382,021.89
5. Step 5: Solve for x
   x = 145,382,021.89/12,840.05
6. Step 6: Final answer
   x = 11,322.55