Finding the Fourth Proportional to 72,255.16, 99,705.36 and 45,028.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,255.16 : 99,705.36 = 45,028.72 : x
2. Step 2: Convert to fraction form
   72,255.16/99,705.36 = 45,028.72/x
3. Step 3: Cross multiply
   72,255.16x = 99,705.36 × 45,028.72
4. Step 4: Simplify right side
   72,255.16x = 4,489,604,737.94
5. Step 5: Solve for x
   x = 4,489,604,737.94/72,255.16
6. Step 6: Final answer
   x = 62,135.42