Finding the Fourth Proportional to 11,150.78, 15,374.61 and 9,635.63

Step by Step Solution

1. Step 1: Write the proportion equation
   11,150.78 : 15,374.61 = 9,635.63 : x
2. Step 2: Convert to fraction form
   11,150.78/15,374.61 = 9,635.63/x
3. Step 3: Cross multiply
   11,150.78x = 15,374.61 × 9,635.63
4. Step 4: Simplify right side
   11,150.78x = 148,143,976.48
5. Step 5: Solve for x
   x = 148,143,976.48/11,150.78
6. Step 6: Final answer
   x = 13,285.53