Finding the Fourth Proportional to 42,271.60, 63,321.28 and 20,017.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,271.60 : 63,321.28 = 20,017.50 : x
2. Step 2: Convert to fraction form
   42,271.60/63,321.28 = 20,017.50/x
3. Step 3: Cross multiply
   42,271.60x = 63,321.28 × 20,017.50
4. Step 4: Simplify right side
   42,271.60x = 1,267,534,053.62
5. Step 5: Solve for x
   x = 1,267,534,053.62/42,271.60
6. Step 6: Final answer
   x = 29,985.48