Finding the Fourth Proportional to 21,064.24, 31,591.50 and 7,917.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064.24 : 31,591.50 = 7,917.94 : x
2. Step 2: Convert to fraction form
   21,064.24/31,591.50 = 7,917.94/x
3. Step 3: Cross multiply
   21,064.24x = 31,591.50 × 7,917.94
4. Step 4: Simplify right side
   21,064.24x = 250,139,601.51
5. Step 5: Solve for x
   x = 250,139,601.51/21,064.24
6. Step 6: Final answer
   x = 11,875.08