Finding the Fourth Proportional to 99,810.58, 137,740.69 and 54,490.48

Step by Step Solution

1. Step 1: Write the proportion equation
   99,810.58 : 137,740.69 = 54,490.48 : x
2. Step 2: Convert to fraction form
   99,810.58/137,740.69 = 54,490.48/x
3. Step 3: Cross multiply
   99,810.58x = 137,740.69 × 54,490.48
4. Step 4: Simplify right side
   99,810.58x = 7,505,555,767.07
5. Step 5: Solve for x
   x = 7,505,555,767.07/99,810.58
6. Step 6: Final answer
   x = 75,198.00