Finding the Fourth Proportional to 42,898.23, 64,361.06 and 13,321.89

Step by Step Solution

1. Step 1: Write the proportion equation
   42,898.23 : 64,361.06 = 13,321.89 : x
2. Step 2: Convert to fraction form
   42,898.23/64,361.06 = 13,321.89/x
3. Step 3: Cross multiply
   42,898.23x = 64,361.06 × 13,321.89
4. Step 4: Simplify right side
   42,898.23x = 857,410,894.99
5. Step 5: Solve for x
   x = 857,410,894.99/42,898.23
6. Step 6: Final answer
   x = 19,987.09