Finding the Fourth Proportional to 21,705.77, 32,573.17 and 7,665.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,705.77 : 32,573.17 = 7,665.91 : x
2. Step 2: Convert to fraction form
   21,705.77/32,573.17 = 7,665.91/x
3. Step 3: Cross multiply
   21,705.77x = 32,573.17 × 7,665.91
4. Step 4: Simplify right side
   21,705.77x = 249,702,917.78
5. Step 5: Solve for x
   x = 249,702,917.78/21,705.77
6. Step 6: Final answer
   x = 11,503.99