Finding the Fourth Proportional to 83,431.82, 115,043.69 and 64,269.05

Step by Step Solution

1. Step 1: Write the proportion equation
   83,431.82 : 115,043.69 = 64,269.05 : x
2. Step 2: Convert to fraction form
   83,431.82/115,043.69 = 64,269.05/x
3. Step 3: Cross multiply
   83,431.82x = 115,043.69 × 64,269.05
4. Step 4: Simplify right side
   83,431.82x = 7,393,748,250.25
5. Step 5: Solve for x
   x = 7,393,748,250.25/83,431.82
6. Step 6: Final answer
   x = 88,620.24