Finding the Fourth Proportional to 7,075.72, 9,742.12 and 5,391.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,075.72 : 9,742.12 = 5,391.72 : x
2. Step 2: Convert to fraction form
   7,075.72/9,742.12 = 5,391.72/x
3. Step 3: Cross multiply
   7,075.72x = 9,742.12 × 5,391.72
4. Step 4: Simplify right side
   7,075.72x = 52,526,783.25
5. Step 5: Solve for x
   x = 52,526,783.25/7,075.72
6. Step 6: Final answer
   x = 7,423.52