Finding the Fourth Proportional to 42,978.80, 64,429.28 and 15,270.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.80 : 64,429.28 = 15,270.32 : x
2. Step 2: Convert to fraction form
   42,978.80/64,429.28 = 15,270.32/x
3. Step 3: Cross multiply
   42,978.80x = 64,429.28 × 15,270.32
4. Step 4: Simplify right side
   42,978.80x = 983,855,722.97
5. Step 5: Solve for x
   x = 983,855,722.97/42,978.80
6. Step 6: Final answer
   x = 22,891.65