Finding the Fourth Proportional to 7,620.10, 10,519.56 and 7,213.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,620.10 : 10,519.56 = 7,213.12 : x
2. Step 2: Convert to fraction form
   7,620.10/10,519.56 = 7,213.12/x
3. Step 3: Cross multiply
   7,620.10x = 10,519.56 × 7,213.12
4. Step 4: Simplify right side
   7,620.10x = 75,878,848.63
5. Step 5: Solve for x
   x = 75,878,848.63/7,620.10
6. Step 6: Final answer
   x = 9,957.72