Finding the Fourth Proportional to 42,399.54, 63,600.66 and 21,328.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,399.54 : 63,600.66 = 21,328.07 : x
2. Step 2: Convert to fraction form
   42,399.54/63,600.66 = 21,328.07/x
3. Step 3: Cross multiply
   42,399.54x = 63,600.66 × 21,328.07
4. Step 4: Simplify right side
   42,399.54x = 1,356,479,010.52
5. Step 5: Solve for x
   x = 1,356,479,010.52/42,399.54
6. Step 6: Final answer
   x = 31,992.78