Finding the Fourth Proportional to 42,872.96, 64,309.47 and 17,899.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,872.96 : 64,309.47 = 17,899.40 : x
2. Step 2: Convert to fraction form
   42,872.96/64,309.47 = 17,899.40/x
3. Step 3: Cross multiply
   42,872.96x = 64,309.47 × 17,899.40
4. Step 4: Simplify right side
   42,872.96x = 1,151,100,538.65
5. Step 5: Solve for x
   x = 1,151,100,538.65/42,872.96
6. Step 6: Final answer
   x = 26,849.10