Finding the Fourth Proportional to 21,748.52, 32,570.42 and 12,365.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,748.52 : 32,570.42 = 12,365.58 : x
2. Step 2: Convert to fraction form
   21,748.52/32,570.42 = 12,365.58/x
3. Step 3: Cross multiply
   21,748.52x = 32,570.42 × 12,365.58
4. Step 4: Simplify right side
   21,748.52x = 402,752,134.14
5. Step 5: Solve for x
   x = 402,752,134.14/21,748.52
6. Step 6: Final answer
   x = 18,518.60