Finding the Fourth Proportional to 21,784.36, 32,670.06 and 7,930.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,784.36 : 32,670.06 = 7,930.12 : x
2. Step 2: Convert to fraction form
   21,784.36/32,670.06 = 7,930.12/x
3. Step 3: Cross multiply
   21,784.36x = 32,670.06 × 7,930.12
4. Step 4: Simplify right side
   21,784.36x = 259,077,496.21
5. Step 5: Solve for x
   x = 259,077,496.21/21,784.36
6. Step 6: Final answer
   x = 11,892.82