Finding the Fourth Proportional to 9,375.75, 12,938.94 and 7,139.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,375.75 : 12,938.94 = 7,139.34 : x
2. Step 2: Convert to fraction form
   9,375.75/12,938.94 = 7,139.34/x
3. Step 3: Cross multiply
   9,375.75x = 12,938.94 × 7,139.34
4. Step 4: Simplify right side
   9,375.75x = 92,375,491.90
5. Step 5: Solve for x
   x = 92,375,491.90/9,375.75
6. Step 6: Final answer
   x = 9,852.60