Finding the Fourth Proportional to 8,065.71, 11,139.12 and 5,554.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,065.71 : 11,139.12 = 5,554.31 : x
2. Step 2: Convert to fraction form
   8,065.71/11,139.12 = 5,554.31/x
3. Step 3: Cross multiply
   8,065.71x = 11,139.12 × 5,554.31
4. Step 4: Simplify right side
   8,065.71x = 61,870,069.91
5. Step 5: Solve for x
   x = 61,870,069.91/8,065.71
6. Step 6: Final answer
   x = 7,670.75