Finding the Fourth Proportional to 38,434.50, 53,040.42 and 21,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   38,434.50 : 53,040.42 = 21,667.50 : x
2. Step 2: Convert to fraction form
   38,434.50/53,040.42 = 21,667.50/x
3. Step 3: Cross multiply
   38,434.50x = 53,040.42 × 21,667.50
4. Step 4: Simplify right side
   38,434.50x = 1,149,253,300.35
5. Step 5: Solve for x
   x = 1,149,253,300.35/38,434.50
6. Step 6: Final answer
   x = 29,901.61