Finding the Fourth Proportional to 21,978.54, 32,966.78 and 7,185.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.54 : 32,966.78 = 7,185.51 : x
2. Step 2: Convert to fraction form
   21,978.54/32,966.78 = 7,185.51/x
3. Step 3: Cross multiply
   21,978.54x = 32,966.78 × 7,185.51
4. Step 4: Simplify right side
   21,978.54x = 236,883,091.43
5. Step 5: Solve for x
   x = 236,883,091.43/21,978.54
6. Step 6: Final answer
   x = 10,777.93