Finding the Fourth Proportional to 6,981.99, 9,636.62 and 4,428.09

Step by Step Solution

1. Step 1: Write the proportion equation
   6,981.99 : 9,636.62 = 4,428.09 : x
2. Step 2: Convert to fraction form
   6,981.99/9,636.62 = 4,428.09/x
3. Step 3: Cross multiply
   6,981.99x = 9,636.62 × 4,428.09
4. Step 4: Simplify right side
   6,981.99x = 42,671,798.52
5. Step 5: Solve for x
   x = 42,671,798.52/6,981.99
6. Step 6: Final answer
   x = 6,111.70