Finding the Fourth Proportional to 42,827.69, 64,247.70 and 13,247.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,827.69 : 64,247.70 = 13,247.82 : x
2. Step 2: Convert to fraction form
   42,827.69/64,247.70 = 13,247.82/x
3. Step 3: Cross multiply
   42,827.69x = 64,247.70 × 13,247.82
4. Step 4: Simplify right side
   42,827.69x = 851,142,014.69
5. Step 5: Solve for x
   x = 851,142,014.69/42,827.69
6. Step 6: Final answer
   x = 19,873.64