Finding the Fourth Proportional to 48,131.50, 72,226.42 and 20,429.50

Step by Step Solution

1. Step 1: Write the proportion equation
   48,131.50 : 72,226.42 = 20,429.50 : x
2. Step 2: Convert to fraction form
   48,131.50/72,226.42 = 20,429.50/x
3. Step 3: Cross multiply
   48,131.50x = 72,226.42 × 20,429.50
4. Step 4: Simplify right side
   48,131.50x = 1,475,549,647.39
5. Step 5: Solve for x
   x = 1,475,549,647.39/48,131.50
6. Step 6: Final answer
   x = 30,656.63