Finding the Fourth Proportional to 21,783.60, 30,048.30 and 13,385.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,783.60 : 30,048.30 = 13,385.52 : x
2. Step 2: Convert to fraction form
   21,783.60/30,048.30 = 13,385.52/x
3. Step 3: Cross multiply
   21,783.60x = 30,048.30 × 13,385.52
4. Step 4: Simplify right side
   21,783.60x = 402,212,120.62
5. Step 5: Solve for x
   x = 402,212,120.62/21,783.60
6. Step 6: Final answer
   x = 18,463.99