Finding the Fourth Proportional to 105,521.72, 158,234.73 and 45,521.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,521.72 : 158,234.73 = 45,521.90 : x
2. Step 2: Convert to fraction form
   105,521.72/158,234.73 = 45,521.90/x
3. Step 3: Cross multiply
   105,521.72x = 158,234.73 × 45,521.90
4. Step 4: Simplify right side
   105,521.72x = 7,203,144,764.41
5. Step 5: Solve for x
   x = 7,203,144,764.41/105,521.72
6. Step 6: Final answer
   x = 68,262.20