Finding the Fourth Proportional to 7,979.31, 10,990.89 and 5,617.35

Step by Step Solution

1. Step 1: Write the proportion equation
   7,979.31 : 10,990.89 = 5,617.35 : x
2. Step 2: Convert to fraction form
   7,979.31/10,990.89 = 5,617.35/x
3. Step 3: Cross multiply
   7,979.31x = 10,990.89 × 5,617.35
4. Step 4: Simplify right side
   7,979.31x = 61,739,675.94
5. Step 5: Solve for x
   x = 61,739,675.94/7,979.31
6. Step 6: Final answer
   x = 7,737.47