Finding the Fourth Proportional to 42,890.80, 64,314.26 and 17,924.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,890.80 : 64,314.26 = 17,924.03 : x
2. Step 2: Convert to fraction form
   42,890.80/64,314.26 = 17,924.03/x
3. Step 3: Cross multiply
   42,890.80x = 64,314.26 × 17,924.03
4. Step 4: Simplify right side
   42,890.80x = 1,152,770,636.05
5. Step 5: Solve for x
   x = 1,152,770,636.05/42,890.80
6. Step 6: Final answer
   x = 26,876.88