Finding the Fourth Proportional to 42,870.56, 64,278.44 and 17,927.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.56 : 64,278.44 = 17,927.80 : x
2. Step 2: Convert to fraction form
   42,870.56/64,278.44 = 17,927.80/x
3. Step 3: Cross multiply
   42,870.56x = 64,278.44 × 17,927.80
4. Step 4: Simplify right side
   42,870.56x = 1,152,371,016.63
5. Step 5: Solve for x
   x = 1,152,371,016.63/42,870.56
6. Step 6: Final answer
   x = 26,880.24