Finding the Fourth Proportional to 5,381.17, 8,020.89 and 5,117.99

Step by Step Solution

1. Step 1: Write the proportion equation
   5,381.17 : 8,020.89 = 5,117.99 : x
2. Step 2: Convert to fraction form
   5,381.17/8,020.89 = 5,117.99/x
3. Step 3: Cross multiply
   5,381.17x = 8,020.89 × 5,117.99
4. Step 4: Simplify right side
   5,381.17x = 41,050,794.71
5. Step 5: Solve for x
   x = 41,050,794.71/5,381.17
6. Step 6: Final answer
   x = 7,628.60