Finding the Fourth Proportional to 30,987.01, 42,761.91 and 16,839.91

Step by Step Solution

1. Step 1: Write the proportion equation
   30,987.01 : 42,761.91 = 16,839.91 : x
2. Step 2: Convert to fraction form
   30,987.01/42,761.91 = 16,839.91/x
3. Step 3: Cross multiply
   30,987.01x = 42,761.91 × 16,839.91
4. Step 4: Simplify right side
   30,987.01x = 720,106,715.83
5. Step 5: Solve for x
   x = 720,106,715.83/30,987.01
6. Step 6: Final answer
   x = 23,238.99