Finding the Fourth Proportional to 72,278.27, 99,648.45 and 59,310.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,278.27 : 99,648.45 = 59,310.05 : x
2. Step 2: Convert to fraction form
   72,278.27/99,648.45 = 59,310.05/x
3. Step 3: Cross multiply
   72,278.27x = 99,648.45 × 59,310.05
4. Step 4: Simplify right side
   72,278.27x = 5,910,154,053.68
5. Step 5: Solve for x
   x = 5,910,154,053.68/72,278.27
6. Step 6: Final answer
   x = 81,769.45