Finding the Fourth Proportional to 42,981.73, 64,472.28 and 30,279.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,981.73 : 64,472.28 = 30,279.20 : x
2. Step 2: Convert to fraction form
   42,981.73/64,472.28 = 30,279.20/x
3. Step 3: Cross multiply
   42,981.73x = 64,472.28 × 30,279.20
4. Step 4: Simplify right side
   42,981.73x = 1,952,169,060.58
5. Step 5: Solve for x
   x = 1,952,169,060.58/42,981.73
6. Step 6: Final answer
   x = 45,418.58