Finding the Fourth Proportional to 120,131.69, 181,008.42 and 99,530.15

Step by Step Solution

1. Step 1: Write the proportion equation
   120,131.69 : 181,008.42 = 99,530.15 : x
2. Step 2: Convert to fraction form
   120,131.69/181,008.42 = 99,530.15/x
3. Step 3: Cross multiply
   120,131.69x = 181,008.42 × 99,530.15
4. Step 4: Simplify right side
   120,131.69x = 18,015,793,915.58
5. Step 5: Solve for x
   x = 18,015,793,915.58/120,131.69
6. Step 6: Final answer
   x = 149,967.05