Finding the Fourth Proportional to 42,698.97, 64,056.69 and 13,111.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,698.97 : 64,056.69 = 13,111.56 : x
2. Step 2: Convert to fraction form
   42,698.97/64,056.69 = 13,111.56/x
3. Step 3: Cross multiply
   42,698.97x = 64,056.69 × 13,111.56
4. Step 4: Simplify right side
   42,698.97x = 839,883,134.34
5. Step 5: Solve for x
   x = 839,883,134.34/42,698.97
6. Step 6: Final answer
   x = 19,669.87