Finding the Fourth Proportional to 60,611.60, 83,604.96 and 39,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   60,611.60 : 83,604.96 = 39,128.72 : x
2. Step 2: Convert to fraction form
   60,611.60/83,604.96 = 39,128.72/x
3. Step 3: Cross multiply
   60,611.60x = 83,604.96 × 39,128.72
4. Step 4: Simplify right side
   60,611.60x = 3,271,355,070.45
5. Step 5: Solve for x
   x = 3,271,355,070.45/60,611.60
6. Step 6: Final answer
   x = 53,972.43