Finding the Fourth Proportional to 5,389.79, 8,070.60 and 5,061.33

Step by Step Solution

1. Step 1: Write the proportion equation
   5,389.79 : 8,070.60 = 5,061.33 : x
2. Step 2: Convert to fraction form
   5,389.79/8,070.60 = 5,061.33/x
3. Step 3: Cross multiply
   5,389.79x = 8,070.60 × 5,061.33
4. Step 4: Simplify right side
   5,389.79x = 40,847,969.90
5. Step 5: Solve for x
   x = 40,847,969.90/5,389.79
6. Step 6: Final answer
   x = 7,578.77