Finding the Fourth Proportional to 10,779.55, 14,867.76 and 9,518.38

Step by Step Solution

1. Step 1: Write the proportion equation
   10,779.55 : 14,867.76 = 9,518.38 : x
2. Step 2: Convert to fraction form
   10,779.55/14,867.76 = 9,518.38/x
3. Step 3: Cross multiply
   10,779.55x = 14,867.76 × 9,518.38
4. Step 4: Simplify right side
   10,779.55x = 141,516,989.43
5. Step 5: Solve for x
   x = 141,516,989.43/10,779.55
6. Step 6: Final answer
   x = 13,128.28