Finding the Fourth Proportional to 42,828.69, 64,249.20 and 13,248.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,828.69 : 64,249.20 = 13,248.82 : x
2. Step 2: Convert to fraction form
   42,828.69/64,249.20 = 13,248.82/x
3. Step 3: Cross multiply
   42,828.69x = 64,249.20 × 13,248.82
4. Step 4: Simplify right side
   42,828.69x = 851,226,085.94
5. Step 5: Solve for x
   x = 851,226,085.94/42,828.69
6. Step 6: Final answer
   x = 19,875.14