Finding the Fourth Proportional to 10,780.05, 14,868.45 and 9,518.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,780.05 : 14,868.45 = 9,518.88 : x
2. Step 2: Convert to fraction form
   10,780.05/14,868.45 = 9,518.88/x
3. Step 3: Cross multiply
   10,780.05x = 14,868.45 × 9,518.88
4. Step 4: Simplify right side
   10,780.05x = 141,530,991.34
5. Step 5: Solve for x
   x = 141,530,991.34/10,780.05
6. Step 6: Final answer
   x = 13,128.97