Finding the Fourth Proportional to 43,109.79, 64,667.42 and 13,528.80

Step by Step Solution

1. Step 1: Write the proportion equation
   43,109.79 : 64,667.42 = 13,528.80 : x
2. Step 2: Convert to fraction form
   43,109.79/64,667.42 = 13,528.80/x
3. Step 3: Cross multiply
   43,109.79x = 64,667.42 × 13,528.80
4. Step 4: Simplify right side
   43,109.79x = 874,872,591.70
5. Step 5: Solve for x
   x = 874,872,591.70/43,109.79
6. Step 6: Final answer
   x = 20,294.06