Finding the Fourth Proportional to 72,680.58, 109,019.79 and 20,088.90

Step by Step Solution

1. Step 1: Write the proportion equation
   72,680.58 : 109,019.79 = 20,088.90 : x
2. Step 2: Convert to fraction form
   72,680.58/109,019.79 = 20,088.90/x
3. Step 3: Cross multiply
   72,680.58x = 109,019.79 × 20,088.90
4. Step 4: Simplify right side
   72,680.58x = 2,190,087,659.33
5. Step 5: Solve for x
   x = 2,190,087,659.33/72,680.58
6. Step 6: Final answer
   x = 30,133.05