Finding the Fourth Proportional to 5,385.89, 8,085.62 and 5,136.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,385.89 : 8,085.62 = 5,136.62 : x
2. Step 2: Convert to fraction form
   5,385.89/8,085.62 = 5,136.62/x
3. Step 3: Cross multiply
   5,385.89x = 8,085.62 × 5,136.62
4. Step 4: Simplify right side
   5,385.89x = 41,532,729.82
5. Step 5: Solve for x
   x = 41,532,729.82/5,385.89
6. Step 6: Final answer
   x = 7,711.39