Finding the Fourth Proportional to 22,388.16, 30,878.88 and 21,395.52

Step by Step Solution

1. Step 1: Write the proportion equation
   22,388.16 : 30,878.88 = 21,395.52 : x
2. Step 2: Convert to fraction form
   22,388.16/30,878.88 = 21,395.52/x
3. Step 3: Cross multiply
   22,388.16x = 30,878.88 × 21,395.52
4. Step 4: Simplify right side
   22,388.16x = 660,669,694.62
5. Step 5: Solve for x
   x = 660,669,694.62/22,388.16
6. Step 6: Final answer
   x = 29,509.78