Finding the Fourth Proportional to 42,870.73, 64,305.51 and 13,288.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.73 : 64,305.51 = 13,288.56 : x
2. Step 2: Convert to fraction form
   42,870.73/64,305.51 = 13,288.56/x
3. Step 3: Cross multiply
   42,870.73x = 64,305.51 × 13,288.56
4. Step 4: Simplify right side
   42,870.73x = 854,527,627.97
5. Step 5: Solve for x
   x = 854,527,627.97/42,870.73
6. Step 6: Final answer
   x = 19,932.66