Finding the Fourth Proportional to 42,878.30, 64,323.68 and 13,298.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,878.30 : 64,323.68 = 13,298.52 : x
2. Step 2: Convert to fraction form
   42,878.30/64,323.68 = 13,298.52/x
3. Step 3: Cross multiply
   42,878.30x = 64,323.68 × 13,298.52
4. Step 4: Simplify right side
   42,878.30x = 855,409,744.95
5. Step 5: Solve for x
   x = 855,409,744.95/42,878.30
6. Step 6: Final answer
   x = 19,949.71