Finding the Fourth Proportional to 42,835.20, 64,219.86 and 21,757.92

Step by Step Solution

1. Step 1: Write the proportion equation
   42,835.20 : 64,219.86 = 21,757.92 : x
2. Step 2: Convert to fraction form
   42,835.20/64,219.86 = 21,757.92/x
3. Step 3: Cross multiply
   42,835.20x = 64,219.86 × 21,757.92
4. Step 4: Simplify right side
   42,835.20x = 1,397,290,576.29
5. Step 5: Solve for x
   x = 1,397,290,576.29/42,835.20
6. Step 6: Final answer
   x = 32,620.15