Finding the Fourth Proportional to 42,859.63, 64,299.72 and 17,885.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,859.63 : 64,299.72 = 17,885.79 : x
2. Step 2: Convert to fraction form
   42,859.63/64,299.72 = 17,885.79/x
3. Step 3: Cross multiply
   42,859.63x = 64,299.72 × 17,885.79
4. Step 4: Simplify right side
   42,859.63x = 1,150,051,288.98
5. Step 5: Solve for x
   x = 1,150,051,288.98/42,859.63
6. Step 6: Final answer
   x = 26,832.97