Finding the Fourth Proportional to 13,047.96, 18,010.86 and 7,742.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,047.96 : 18,010.86 = 7,742.78 : x
2. Step 2: Convert to fraction form
   13,047.96/18,010.86 = 7,742.78/x
3. Step 3: Cross multiply
   13,047.96x = 18,010.86 × 7,742.78
4. Step 4: Simplify right side
   13,047.96x = 139,454,049.71
5. Step 5: Solve for x
   x = 139,454,049.71/13,047.96
6. Step 6: Final answer
   x = 10,687.80