Finding the Fourth Proportional to 7,980.31, 10,992.27 and 5,618.35

Step by Step Solution

1. Step 1: Write the proportion equation
   7,980.31 : 10,992.27 = 5,618.35 : x
2. Step 2: Convert to fraction form
   7,980.31/10,992.27 = 5,618.35/x
3. Step 3: Cross multiply
   7,980.31x = 10,992.27 × 5,618.35
4. Step 4: Simplify right side
   7,980.31x = 61,758,420.15
5. Step 5: Solve for x
   x = 61,758,420.15/7,980.31
6. Step 6: Final answer
   x = 7,738.85