Finding the Fourth Proportional to 21,426.48, 32,151.96 and 12,678.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,426.48 : 32,151.96 = 12,678.48 : x
2. Step 2: Convert to fraction form
   21,426.48/32,151.96 = 12,678.48/x
3. Step 3: Cross multiply
   21,426.48x = 32,151.96 × 12,678.48
4. Step 4: Simplify right side
   21,426.48x = 407,637,981.82
5. Step 5: Solve for x
   x = 407,637,981.82/21,426.48
6. Step 6: Final answer
   x = 19,024.96