Finding the Fourth Proportional to 42,720.20, 64,145.10 and 32,870.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,720.20 : 64,145.10 = 32,870.60 : x
2. Step 2: Convert to fraction form
   42,720.20/64,145.10 = 32,870.60/x
3. Step 3: Cross multiply
   42,720.20x = 64,145.10 × 32,870.60
4. Step 4: Simplify right side
   42,720.20x = 2,108,487,924.06
5. Step 5: Solve for x
   x = 2,108,487,924.06/42,720.20
6. Step 6: Final answer
   x = 49,355.76