Finding the Fourth Proportional to 42,804.48, 64,221.86 and 19,109.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,804.48 : 64,221.86 = 19,109.82 : x
2. Step 2: Convert to fraction form
   42,804.48/64,221.86 = 19,109.82/x
3. Step 3: Cross multiply
   42,804.48x = 64,221.86 × 19,109.82
4. Step 4: Simplify right side
   42,804.48x = 1,227,268,184.67
5. Step 5: Solve for x
   x = 1,227,268,184.67/42,804.48
6. Step 6: Final answer
   x = 28,671.49