Finding the Fourth Proportional to 42,799.42, 64,164.34 and 17,858.05

Step by Step Solution

1. Step 1: Write the proportion equation
   42,799.42 : 64,164.34 = 17,858.05 : x
2. Step 2: Convert to fraction form
   42,799.42/64,164.34 = 17,858.05/x
3. Step 3: Cross multiply
   42,799.42x = 64,164.34 × 17,858.05
4. Step 4: Simplify right side
   42,799.42x = 1,145,849,991.94
5. Step 5: Solve for x
   x = 1,145,849,991.94/42,799.42
6. Step 6: Final answer
   x = 26,772.56