Finding the Fourth Proportional to 81,431.82, 112,383.15 and 45,621.60

Step by Step Solution

1. Step 1: Write the proportion equation
   81,431.82 : 112,383.15 = 45,621.60 : x
2. Step 2: Convert to fraction form
   81,431.82/112,383.15 = 45,621.60/x
3. Step 3: Cross multiply
   81,431.82x = 112,383.15 × 45,621.60
4. Step 4: Simplify right side
   81,431.82x = 5,127,099,116.04
5. Step 5: Solve for x
   x = 5,127,099,116.04/81,431.82
6. Step 6: Final answer
   x = 62,961.86