Finding the Fourth Proportional to 9,353.70, 12,909.60 and 7,111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,353.70 : 12,909.60 = 7,111.98 : x
2. Step 2: Convert to fraction form
   9,353.70/12,909.60 = 7,111.98/x
3. Step 3: Cross multiply
   9,353.70x = 12,909.60 × 7,111.98
4. Step 4: Simplify right side
   9,353.70x = 91,812,817.01
5. Step 5: Solve for x
   x = 91,812,817.01/9,353.70
6. Step 6: Final answer
   x = 9,815.67