Finding the Fourth Proportional to 42,789.04, 64,180.56 and 13,203.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.04 : 64,180.56 = 13,203.76 : x
2. Step 2: Convert to fraction form
   42,789.04/64,180.56 = 13,203.76/x
3. Step 3: Cross multiply
   42,789.04x = 64,180.56 × 13,203.76
4. Step 4: Simplify right side
   42,789.04x = 847,424,710.91
5. Step 5: Solve for x
   x = 847,424,710.91/42,789.04
6. Step 6: Final answer
   x = 19,804.71