Finding the Fourth Proportional to 89,716.80, 134,429.40 and 74,845.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,716.80 : 134,429.40 = 74,845.20 : x
2. Step 2: Convert to fraction form
   89,716.80/134,429.40 = 74,845.20/x
3. Step 3: Cross multiply
   89,716.80x = 134,429.40 × 74,845.20
4. Step 4: Simplify right side
   89,716.80x = 10,061,395,328.88
5. Step 5: Solve for x
   x = 10,061,395,328.88/89,716.80
6. Step 6: Final answer
   x = 112,146.17