Finding the Fourth Proportional to 42,804.70, 64,218.86 and 17,856.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,804.70 : 64,218.86 = 17,856.48 : x
2. Step 2: Convert to fraction form
   42,804.70/64,218.86 = 17,856.48/x
3. Step 3: Cross multiply
   42,804.70x = 64,218.86 × 17,856.48
4. Step 4: Simplify right side
   42,804.70x = 1,146,722,789.21
5. Step 5: Solve for x
   x = 1,146,722,789.21/42,804.70
6. Step 6: Final answer
   x = 26,789.65