Finding the Fourth Proportional to 73,128.30, 109,606.05 and 31,008.30

Step by Step Solution

1. Step 1: Write the proportion equation
   73,128.30 : 109,606.05 = 31,008.30 : x
2. Step 2: Convert to fraction form
   73,128.30/109,606.05 = 31,008.30/x
3. Step 3: Cross multiply
   73,128.30x = 109,606.05 × 31,008.30
4. Step 4: Simplify right side
   73,128.30x = 3,398,697,280.22
5. Step 5: Solve for x
   x = 3,398,697,280.22/73,128.30
6. Step 6: Final answer
   x = 46,475.81