Finding the Fourth Proportional to 9,415.31, 12,992.69 and 5,166.27

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.31 : 12,992.69 = 5,166.27 : x
2. Step 2: Convert to fraction form
   9,415.31/12,992.69 = 5,166.27/x
3. Step 3: Cross multiply
   9,415.31x = 12,992.69 × 5,166.27
4. Step 4: Simplify right side
   9,415.31x = 67,123,679.60
5. Step 5: Solve for x
   x = 67,123,679.60/9,415.31
6. Step 6: Final answer
   x = 7,129.21