Finding the Fourth Proportional to 112,596.72, 155,404.32 and 72,360.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,596.72 : 155,404.32 = 72,360.78 : x
2. Step 2: Convert to fraction form
   112,596.72/155,404.32 = 72,360.78/x
3. Step 3: Cross multiply
   112,596.72x = 155,404.32 × 72,360.78
4. Step 4: Simplify right side
   112,596.72x = 11,245,177,810.57
5. Step 5: Solve for x
   x = 11,245,177,810.57/112,596.72
6. Step 6: Final answer
   x = 99,871.27