Finding the Third Proportional to 3,915.56 and 8,816.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.56 : 8,816.91 = 8,816.91 : x
2. Step 2: Convert to fraction form
   3,915.56/8,816.91 = 8,816.91/x
3. Step 3: Cross multiply
   3,915.56x = 8,816.91 × 8,816.91
4. Step 4: Simplify right side
   3,915.56x = 77,737,835.82
5. Step 5: Solve for x
   x = 77,737,835.82/3,915.56
6. Step 6: Final answer
   x = 19,853.56