Finding the Fourth Proportional to 9,271.47, 12,784.46 and 7,142.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,271.47 : 12,784.46 = 7,142.39 : x
2. Step 2: Convert to fraction form
   9,271.47/12,784.46 = 7,142.39/x
3. Step 3: Cross multiply
   9,271.47x = 12,784.46 × 7,142.39
4. Step 4: Simplify right side
   9,271.47x = 91,311,499.63
5. Step 5: Solve for x
   x = 91,311,499.63/9,271.47
6. Step 6: Final answer
   x = 9,848.65