Finding the Fourth Proportional to 21,320.28, 29,468.70 and 18,783

Step by Step Solution

1. Step 1: Write the proportion equation
   21,320.28 : 29,468.70 = 18,783 : x
2. Step 2: Convert to fraction form
   21,320.28/29,468.70 = 18,783/x
3. Step 3: Cross multiply
   21,320.28x = 29,468.70 × 18,783
4. Step 4: Simplify right side
   21,320.28x = 553,510,592.10
5. Step 5: Solve for x
   x = 553,510,592.10/21,320.28
6. Step 6: Final answer
   x = 25,961.69