Finding the Fourth Proportional to 42,798.51, 64,162.98 and 17,857.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,798.51 : 64,162.98 = 17,857.15 : x
2. Step 2: Convert to fraction form
   42,798.51/64,162.98 = 17,857.15/x
3. Step 3: Cross multiply
   42,798.51x = 64,162.98 × 17,857.15
4. Step 4: Simplify right side
   42,798.51x = 1,145,767,797.90
5. Step 5: Solve for x
   x = 1,145,767,797.90/42,798.51
6. Step 6: Final answer
   x = 26,771.21