Finding the Fourth Proportional to 72,840.72, 109,303.56 and 30,718.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,840.72 : 109,303.56 = 30,718.20 : x
2. Step 2: Convert to fraction form
   72,840.72/109,303.56 = 30,718.20/x
3. Step 3: Cross multiply
   72,840.72x = 109,303.56 × 30,718.20
4. Step 4: Simplify right side
   72,840.72x = 3,357,608,616.79
5. Step 5: Solve for x
   x = 3,357,608,616.79/72,840.72
6. Step 6: Final answer
   x = 46,095.21