Finding the Fourth Proportional to 21,071.58, 31,623.69 and 7,935.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,071.58 : 31,623.69 = 7,935.90 : x
2. Step 2: Convert to fraction form
   21,071.58/31,623.69 = 7,935.90/x
3. Step 3: Cross multiply
   21,071.58x = 31,623.69 × 7,935.90
4. Step 4: Simplify right side
   21,071.58x = 250,962,441.47
5. Step 5: Solve for x
   x = 250,962,441.47/21,071.58
6. Step 6: Final answer
   x = 11,910.00