Finding the Fourth Proportional to 72,749, 109,123.62 and 20,158.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72,749 : 109,123.62 = 20,158.61 : x
2. Step 2: Convert to fraction form
   72,749/109,123.62 = 20,158.61/x
3. Step 3: Cross multiply
   72,749x = 109,123.62 × 20,158.61
4. Step 4: Simplify right side
   72,749x = 2,199,780,497.37
5. Step 5: Solve for x
   x = 2,199,780,497.37/72,749
6. Step 6: Final answer
   x = 30,237.95