Finding the Fourth Proportional to 8,428.05, 11,631.71 and 5,072.54

Step by Step Solution

1. Step 1: Write the proportion equation
   8,428.05 : 11,631.71 = 5,072.54 : x
2. Step 2: Convert to fraction form
   8,428.05/11,631.71 = 5,072.54/x
3. Step 3: Cross multiply
   8,428.05x = 11,631.71 × 5,072.54
4. Step 4: Simplify right side
   8,428.05x = 59,002,268.77
5. Step 5: Solve for x
   x = 59,002,268.77/8,428.05
6. Step 6: Final answer
   x = 7,000.70