Finding the Fourth Proportional to 42,405.20, 59,449.20 and 42,405.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,405.20 : 59,449.20 = 42,405.20 : x
2. Step 2: Convert to fraction form
   42,405.20/59,449.20 = 42,405.20/x
3. Step 3: Cross multiply
   42,405.20x = 59,449.20 × 42,405.20
4. Step 4: Simplify right side
   42,405.20x = 2,520,955,215.84
5. Step 5: Solve for x
   x = 2,520,955,215.84/42,405.20
6. Step 6: Final answer
   x = 59,449.20