Finding the Fourth Proportional to 21,981.87, 32,978.02 and 7,191.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,981.87 : 32,978.02 = 7,191.98 : x
2. Step 2: Convert to fraction form
   21,981.87/32,978.02 = 7,191.98/x
3. Step 3: Cross multiply
   21,981.87x = 32,978.02 × 7,191.98
4. Step 4: Simplify right side
   21,981.87x = 237,177,260.28
5. Step 5: Solve for x
   x = 237,177,260.28/21,981.87
6. Step 6: Final answer
   x = 10,789.68