Finding the Fourth Proportional to 42,698.54, 64,086.88 and 21,653.11

Step by Step Solution

1. Step 1: Write the proportion equation
   42,698.54 : 64,086.88 = 21,653.11 : x
2. Step 2: Convert to fraction form
   42,698.54/64,086.88 = 21,653.11/x
3. Step 3: Cross multiply
   42,698.54x = 64,086.88 × 21,653.11
4. Step 4: Simplify right side
   42,698.54x = 1,387,680,262.20
5. Step 5: Solve for x
   x = 1,387,680,262.20/42,698.54
6. Step 6: Final answer
   x = 32,499.48