Finding the Fourth Proportional to 150,160.78, 207,131.78 and 99,173.61

Step by Step Solution

1. Step 1: Write the proportion equation
   150,160.78 : 207,131.78 = 99,173.61 : x
2. Step 2: Convert to fraction form
   150,160.78/207,131.78 = 99,173.61/x
3. Step 3: Cross multiply
   150,160.78x = 207,131.78 × 99,173.61
4. Step 4: Simplify right side
   150,160.78x = 20,542,006,368.33
5. Step 5: Solve for x
   x = 20,542,006,368.33/150,160.78
6. Step 6: Final answer
   x = 136,800.08