Finding the Fourth Proportional to 21,988.61, 32,986.42 and 7,947.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,988.61 : 32,986.42 = 7,947.22 : x
2. Step 2: Convert to fraction form
   21,988.61/32,986.42 = 7,947.22/x
3. Step 3: Cross multiply
   21,988.61x = 32,986.42 × 7,947.22
4. Step 4: Simplify right side
   21,988.61x = 262,150,264.22
5. Step 5: Solve for x
   x = 262,150,264.22/21,988.61
6. Step 6: Final answer
   x = 11,922.09