Finding the Fourth Proportional to 42,019.35, 63,026.79 and 15,721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   42,019.35 : 63,026.79 = 15,721.89 : x
2. Step 2: Convert to fraction form
   42,019.35/63,026.79 = 15,721.89/x
3. Step 3: Cross multiply
   42,019.35x = 63,026.79 × 15,721.89
4. Step 4: Simplify right side
   42,019.35x = 990,900,259.43
5. Step 5: Solve for x
   x = 990,900,259.43/42,019.35
6. Step 6: Final answer
   x = 23,582.00