Finding the Fourth Proportional to 99,810.84, 137,736.90 and 54,489.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,810.84 : 137,736.90 = 54,489.72 : x
2. Step 2: Convert to fraction form
   99,810.84/137,736.90 = 54,489.72/x
3. Step 3: Cross multiply
   99,810.84x = 137,736.90 × 54,489.72
4. Step 4: Simplify right side
   99,810.84x = 7,505,245,114.67
5. Step 5: Solve for x
   x = 7,505,245,114.67/99,810.84
6. Step 6: Final answer
   x = 75,194.69