Finding the Fourth Proportional to 9,406.18, 12,980.43 and 5,157.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.18 : 12,980.43 = 5,157.47 : x
2. Step 2: Convert to fraction form
   9,406.18/12,980.43 = 5,157.47/x
3. Step 3: Cross multiply
   9,406.18x = 12,980.43 × 5,157.47
4. Step 4: Simplify right side
   9,406.18x = 66,946,178.31
5. Step 5: Solve for x
   x = 66,946,178.31/9,406.18
6. Step 6: Final answer
   x = 7,117.26