Finding the Fourth Proportional to 8,051.54, 11,105.50 and 7,780.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,051.54 : 11,105.50 = 7,780.59 : x
2. Step 2: Convert to fraction form
   8,051.54/11,105.50 = 7,780.59/x
3. Step 3: Cross multiply
   8,051.54x = 11,105.50 × 7,780.59
4. Step 4: Simplify right side
   8,051.54x = 86,407,315.50
5. Step 5: Solve for x
   x = 86,407,315.50/8,051.54
6. Step 6: Final answer
   x = 10,731.78