Finding the Fourth Proportional to 42,784.06, 64,122.60 and 20,591.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,784.06 : 64,122.60 = 20,591.48 : x
2. Step 2: Convert to fraction form
   42,784.06/64,122.60 = 20,591.48/x
3. Step 3: Cross multiply
   42,784.06x = 64,122.60 × 20,591.48
4. Step 4: Simplify right side
   42,784.06x = 1,320,379,235.45
5. Step 5: Solve for x
   x = 1,320,379,235.45/42,784.06
6. Step 6: Final answer
   x = 30,861.48