Finding the Fourth Proportional to 31,018.16, 42,809.15 and 30,173.77

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.16 : 42,809.15 = 30,173.77 : x
2. Step 2: Convert to fraction form
   31,018.16/42,809.15 = 30,173.77/x
3. Step 3: Cross multiply
   31,018.16x = 42,809.15 × 30,173.77
4. Step 4: Simplify right side
   31,018.16x = 1,291,713,446.00
5. Step 5: Solve for x
   x = 1,291,713,446.00/31,018.16
6. Step 6: Final answer
   x = 41,643.78