Finding the Fourth Proportional to 72,064.80, 108,161.20 and 42,445.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,064.80 : 108,161.20 = 42,445.60 : x
2. Step 2: Convert to fraction form
   72,064.80/108,161.20 = 42,445.60/x
3. Step 3: Cross multiply
   72,064.80x = 108,161.20 × 42,445.60
4. Step 4: Simplify right side
   72,064.80x = 4,590,967,030.72
5. Step 5: Solve for x
   x = 4,590,967,030.72/72,064.80
6. Step 6: Final answer
   x = 63,706.10