Finding the Fourth Proportional to 8,807.05, 12,153.34 and 5,272.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,807.05 : 12,153.34 = 5,272.21 : x
2. Step 2: Convert to fraction form
   8,807.05/12,153.34 = 5,272.21/x
3. Step 3: Cross multiply
   8,807.05x = 12,153.34 × 5,272.21
4. Step 4: Simplify right side
   8,807.05x = 64,074,914.10
5. Step 5: Solve for x
   x = 64,074,914.10/8,807.05
6. Step 6: Final answer
   x = 7,275.42