Finding the Fourth Proportional to 42,957.18, 64,401.75 and 19,570.86

Step by Step Solution

1. Step 1: Write the proportion equation
   42,957.18 : 64,401.75 = 19,570.86 : x
2. Step 2: Convert to fraction form
   42,957.18/64,401.75 = 19,570.86/x
3. Step 3: Cross multiply
   42,957.18x = 64,401.75 × 19,570.86
4. Step 4: Simplify right side
   42,957.18x = 1,260,397,633.01
5. Step 5: Solve for x
   x = 1,260,397,633.01/42,957.18
6. Step 6: Final answer
   x = 29,340.79