Finding the Fourth Proportional to 99,811, 137,739.62 and 54,490.04

Step by Step Solution

1. Step 1: Write the proportion equation
   99,811 : 137,739.62 = 54,490.04 : x
2. Step 2: Convert to fraction form
   99,811/137,739.62 = 54,490.04/x
3. Step 3: Cross multiply
   99,811x = 137,739.62 × 54,490.04
4. Step 4: Simplify right side
   99,811x = 7,505,437,403.38
5. Step 5: Solve for x
   x = 7,505,437,403.38/99,811
6. Step 6: Final answer
   x = 75,196.50