Finding the Fourth Proportional to 82,587, 113,968.20 and 48,129.60

Step by Step Solution

1. Step 1: Write the proportion equation
   82,587 : 113,968.20 = 48,129.60 : x
2. Step 2: Convert to fraction form
   82,587/113,968.20 = 48,129.60/x
3. Step 3: Cross multiply
   82,587x = 113,968.20 × 48,129.60
4. Step 4: Simplify right side
   82,587x = 5,485,243,878.72
5. Step 5: Solve for x
   x = 5,485,243,878.72/82,587
6. Step 6: Final answer
   x = 66,417.76