Finding the Fourth Proportional to 70,327.42, 105,487.88 and 20,406.50

Step by Step Solution

1. Step 1: Write the proportion equation
   70,327.42 : 105,487.88 = 20,406.50 : x
2. Step 2: Convert to fraction form
   70,327.42/105,487.88 = 20,406.50/x
3. Step 3: Cross multiply
   70,327.42x = 105,487.88 × 20,406.50
4. Step 4: Simplify right side
   70,327.42x = 2,152,638,423.22
5. Step 5: Solve for x
   x = 2,152,638,423.22/70,327.42
6. Step 6: Final answer
   x = 30,608.81