Finding the Fourth Proportional to 20,105.88, 30,154.70 and 7,621.60

Step by Step Solution

1. Step 1: Write the proportion equation
   20,105.88 : 30,154.70 = 7,621.60 : x
2. Step 2: Convert to fraction form
   20,105.88/30,154.70 = 7,621.60/x
3. Step 3: Cross multiply
   20,105.88x = 30,154.70 × 7,621.60
4. Step 4: Simplify right side
   20,105.88x = 229,827,061.52
5. Step 5: Solve for x
   x = 229,827,061.52/20,105.88
6. Step 6: Final answer
   x = 11,430.84