Finding the Fourth Proportional to 21,978.96, 32,972.49 and 7,188.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.96 : 32,972.49 = 7,188.71 : x
2. Step 2: Convert to fraction form
   21,978.96/32,972.49 = 7,188.71/x
3. Step 3: Cross multiply
   21,978.96x = 32,972.49 × 7,188.71
4. Step 4: Simplify right side
   21,978.96x = 237,029,503.73
5. Step 5: Solve for x
   x = 237,029,503.73/21,978.96
6. Step 6: Final answer
   x = 10,784.38