Finding the Fourth Proportional to 72,521.80, 109,074.30 and 64,940.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,521.80 : 109,074.30 = 64,940.20 : x
2. Step 2: Convert to fraction form
   72,521.80/109,074.30 = 64,940.20/x
3. Step 3: Cross multiply
   72,521.80x = 109,074.30 × 64,940.20
4. Step 4: Simplify right side
   72,521.80x = 7,083,306,856.86
5. Step 5: Solve for x
   x = 7,083,306,856.86/72,521.80
6. Step 6: Final answer
   x = 97,671.42