Finding the Fourth Proportional to 7,807.54, 10,772.69 and 5,290.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,807.54 : 10,772.69 = 5,290.10 : x
2. Step 2: Convert to fraction form
   7,807.54/10,772.69 = 5,290.10/x
3. Step 3: Cross multiply
   7,807.54x = 10,772.69 × 5,290.10
4. Step 4: Simplify right side
   7,807.54x = 56,988,607.37
5. Step 5: Solve for x
   x = 56,988,607.37/7,807.54
6. Step 6: Final answer
   x = 7,299.18