Finding the Fourth Proportional to 71,772.72, 99,063.93 and 55,608.05

Step by Step Solution

1. Step 1: Write the proportion equation
   71,772.72 : 99,063.93 = 55,608.05 : x
2. Step 2: Convert to fraction form
   71,772.72/99,063.93 = 55,608.05/x
3. Step 3: Cross multiply
   71,772.72x = 99,063.93 × 55,608.05
4. Step 4: Simplify right side
   71,772.72x = 5,508,751,477.32
5. Step 5: Solve for x
   x = 5,508,751,477.32/71,772.72
6. Step 6: Final answer
   x = 76,752.72