Finding the Fourth Proportional to 21,191.49, 31,788.05 and 7,151.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,191.49 : 31,788.05 = 7,151.76 : x
2. Step 2: Convert to fraction form
   21,191.49/31,788.05 = 7,151.76/x
3. Step 3: Cross multiply
   21,191.49x = 31,788.05 × 7,151.76
4. Step 4: Simplify right side
   21,191.49x = 227,340,468.71
5. Step 5: Solve for x
   x = 227,340,468.71/21,191.49
6. Step 6: Final answer
   x = 10,727.91