Finding the Fourth Proportional to 21,064.61, 31,572.61 and 7,908.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064.61 : 31,572.61 = 7,908.59 : x
2. Step 2: Convert to fraction form
   21,064.61/31,572.61 = 7,908.59/x
3. Step 3: Cross multiply
   21,064.61x = 31,572.61 × 7,908.59
4. Step 4: Simplify right side
   21,064.61x = 249,694,630.31
5. Step 5: Solve for x
   x = 249,694,630.31/21,064.61
6. Step 6: Final answer
   x = 11,853.75