Finding the Fourth Proportional to 100,987.68, 139,268.52 and 79,817.52

Step by Step Solution

1. Step 1: Write the proportion equation
   100,987.68 : 139,268.52 = 79,817.52 : x
2. Step 2: Convert to fraction form
   100,987.68/139,268.52 = 79,817.52/x
3. Step 3: Cross multiply
   100,987.68x = 139,268.52 × 79,817.52
4. Step 4: Simplify right side
   100,987.68x = 11,116,067,880.47
5. Step 5: Solve for x
   x = 11,116,067,880.47/100,987.68
6. Step 6: Final answer
   x = 110,073.50