Finding the Fourth Proportional to 113,109.77, 155,987.20 and 76,865.31

Step by Step Solution

1. Step 1: Write the proportion equation
   113,109.77 : 155,987.20 = 76,865.31 : x
2. Step 2: Convert to fraction form
   113,109.77/155,987.20 = 76,865.31/x
3. Step 3: Cross multiply
   113,109.77x = 155,987.20 × 76,865.31
4. Step 4: Simplify right side
   113,109.77x = 11,990,004,484.03
5. Step 5: Solve for x
   x = 11,990,004,484.03/113,109.77
6. Step 6: Final answer
   x = 106,003.26