Finding the Fourth Proportional to 13,262.78, 18,316.89 and 8,238.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,262.78 : 18,316.89 = 8,238.93 : x
2. Step 2: Convert to fraction form
   13,262.78/18,316.89 = 8,238.93/x
3. Step 3: Cross multiply
   13,262.78x = 18,316.89 × 8,238.93
4. Step 4: Simplify right side
   13,262.78x = 150,911,574.53
5. Step 5: Solve for x
   x = 150,911,574.53/13,262.78
6. Step 6: Final answer
   x = 11,378.58