Finding the Fourth Proportional to 261,987.48, 392,965.83 and 72,443.30

Step by Step Solution

1. Step 1: Write the proportion equation
   261,987.48 : 392,965.83 = 72,443.30 : x
2. Step 2: Convert to fraction form
   261,987.48/392,965.83 = 72,443.30/x
3. Step 3: Cross multiply
   261,987.48x = 392,965.83 × 72,443.30
4. Step 4: Simplify right side
   261,987.48x = 28,467,739,547.61
5. Step 5: Solve for x
   x = 28,467,739,547.61/261,987.48
6. Step 6: Final answer
   x = 108,660.69