Finding the Fourth Proportional to 72,991.48, 109,273.98 and 65,987.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,991.48 : 109,273.98 = 65,987.68 : x
2. Step 2: Convert to fraction form
   72,991.48/109,273.98 = 65,987.68/x
3. Step 3: Cross multiply
   72,991.48x = 109,273.98 × 65,987.68
4. Step 4: Simplify right side
   72,991.48x = 7,210,736,424.57
5. Step 5: Solve for x
   x = 7,210,736,424.57/72,991.48
6. Step 6: Final answer
   x = 98,788.74