Finding the Fourth Proportional to 42,799.64, 64,164.66 and 17,858.27

Step by Step Solution

1. Step 1: Write the proportion equation
   42,799.64 : 64,164.66 = 17,858.27 : x
2. Step 2: Convert to fraction form
   42,799.64/64,164.66 = 17,858.27/x
3. Step 3: Cross multiply
   42,799.64x = 64,164.66 × 17,858.27
4. Step 4: Simplify right side
   42,799.64x = 1,145,869,501.91
5. Step 5: Solve for x
   x = 1,145,869,501.91/42,799.64
6. Step 6: Final answer
   x = 26,772.88