Finding the Fourth Proportional to 42,979.32, 64,443.09 and 19,282.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,979.32 : 64,443.09 = 19,282.50 : x
2. Step 2: Convert to fraction form
   42,979.32/64,443.09 = 19,282.50/x
3. Step 3: Cross multiply
   42,979.32x = 64,443.09 × 19,282.50
4. Step 4: Simplify right side
   42,979.32x = 1,242,623,882.93
5. Step 5: Solve for x
   x = 1,242,623,882.93/42,979.32
6. Step 6: Final answer
   x = 28,912.13