Finding the Fourth Proportional to 150,018.17, 207,025.15 and 85,485.57

Step by Step Solution

1. Step 1: Write the proportion equation
   150,018.17 : 207,025.15 = 85,485.57 : x
2. Step 2: Convert to fraction form
   150,018.17/207,025.15 = 85,485.57/x
3. Step 3: Cross multiply
   150,018.17x = 207,025.15 × 85,485.57
4. Step 4: Simplify right side
   150,018.17x = 17,697,662,952.09
5. Step 5: Solve for x
   x = 17,697,662,952.09/150,018.17
6. Step 6: Final answer
   x = 117,970.13