Finding the Fourth Proportional to 10,300.86, 15,414.38 and 8,918.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,300.86 : 15,414.38 = 8,918.98 : x
2. Step 2: Convert to fraction form
   10,300.86/15,414.38 = 8,918.98/x
3. Step 3: Cross multiply
   10,300.86x = 15,414.38 × 8,918.98
4. Step 4: Simplify right side
   10,300.86x = 137,480,546.93
5. Step 5: Solve for x
   x = 137,480,546.93/10,300.86
6. Step 6: Final answer
   x = 13,346.51