Finding the Fourth Proportional to 13,439.67, 18,547.89 and 7,776.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,439.67 : 18,547.89 = 7,776.05 : x
2. Step 2: Convert to fraction form
   13,439.67/18,547.89 = 7,776.05/x
3. Step 3: Cross multiply
   13,439.67x = 18,547.89 × 7,776.05
4. Step 4: Simplify right side
   13,439.67x = 144,229,302.47
5. Step 5: Solve for x
   x = 144,229,302.47/13,439.67
6. Step 6: Final answer
   x = 10,731.61