Finding the Fourth Proportional to 9,415.02, 12,992.73 and 5,166.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.02 : 12,992.73 = 5,166.12 : x
2. Step 2: Convert to fraction form
   9,415.02/12,992.73 = 5,166.12/x
3. Step 3: Cross multiply
   9,415.02x = 12,992.73 × 5,166.12
4. Step 4: Simplify right side
   9,415.02x = 67,122,002.31
5. Step 5: Solve for x
   x = 67,122,002.31/9,415.02
6. Step 6: Final answer
   x = 7,129.25