Finding the Fourth Proportional to 21,061.63, 31,595.87 and 7,915.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.63 : 31,595.87 = 7,915.06 : x
2. Step 2: Convert to fraction form
   21,061.63/31,595.87 = 7,915.06/x
3. Step 3: Cross multiply
   21,061.63x = 31,595.87 × 7,915.06
4. Step 4: Simplify right side
   21,061.63x = 250,083,206.80
5. Step 5: Solve for x
   x = 250,083,206.80/21,061.63
6. Step 6: Final answer
   x = 11,873.88