Finding the Fourth Proportional to 28,667.10, 42,979.68 and 19,283.79

Step by Step Solution

1. Step 1: Write the proportion equation
   28,667.10 : 42,979.68 = 19,283.79 : x
2. Step 2: Convert to fraction form
   28,667.10/42,979.68 = 19,283.79/x
3. Step 3: Cross multiply
   28,667.10x = 42,979.68 × 19,283.79
4. Step 4: Simplify right side
   28,667.10x = 828,811,123.39
5. Step 5: Solve for x
   x = 828,811,123.39/28,667.10
6. Step 6: Final answer
   x = 28,911.58