Finding the Fourth Proportional to 89,770.60, 134,493.90 and 42,920.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,770.60 : 134,493.90 = 42,920.20 : x
2. Step 2: Convert to fraction form
   89,770.60/134,493.90 = 42,920.20/x
3. Step 3: Cross multiply
   89,770.60x = 134,493.90 × 42,920.20
4. Step 4: Simplify right side
   89,770.60x = 5,772,505,086.78
5. Step 5: Solve for x
   x = 5,772,505,086.78/89,770.60
6. Step 6: Final answer
   x = 64,302.85