Finding the Fourth Proportional to 42,173.76, 63,271.59 and 12,591.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,173.76 : 63,271.59 = 12,591.60 : x
2. Step 2: Convert to fraction form
   42,173.76/63,271.59 = 12,591.60/x
3. Step 3: Cross multiply
   42,173.76x = 63,271.59 × 12,591.60
4. Step 4: Simplify right side
   42,173.76x = 796,690,552.64
5. Step 5: Solve for x
   x = 796,690,552.64/42,173.76
6. Step 6: Final answer
   x = 18,890.67