Finding the Fourth Proportional to 9,938.72, 14,888.64 and 7,618.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,938.72 : 14,888.64 = 7,618.88 : x
2. Step 2: Convert to fraction form
   9,938.72/14,888.64 = 7,618.88/x
3. Step 3: Cross multiply
   9,938.72x = 14,888.64 × 7,618.88
4. Step 4: Simplify right side
   9,938.72x = 113,434,761.52
5. Step 5: Solve for x
   x = 113,434,761.52/9,938.72
6. Step 6: Final answer
   x = 11,413.42