Finding the Fourth Proportional to 99,872.89, 137,823.76 and 54,550.90

Step by Step Solution

1. Step 1: Write the proportion equation
   99,872.89 : 137,823.76 = 54,550.90 : x
2. Step 2: Convert to fraction form
   99,872.89/137,823.76 = 54,550.90/x
3. Step 3: Cross multiply
   99,872.89x = 137,823.76 × 54,550.90
4. Step 4: Simplify right side
   99,872.89x = 7,518,409,187.51
5. Step 5: Solve for x
   x = 7,518,409,187.51/99,872.89
6. Step 6: Final answer
   x = 75,279.78