Finding the Fourth Proportional to 7,618.10, 10,516.80 and 7,211.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,618.10 : 10,516.80 = 7,211.12 : x
2. Step 2: Convert to fraction form
   7,618.10/10,516.80 = 7,211.12/x
3. Step 3: Cross multiply
   7,618.10x = 10,516.80 × 7,211.12
4. Step 4: Simplify right side
   7,618.10x = 75,837,906.82
5. Step 5: Solve for x
   x = 75,837,906.82/7,618.10
6. Step 6: Final answer
   x = 9,954.96