Finding the Fourth Proportional to 72,988.58, 100,724.96 and 42,791.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,988.58 : 100,724.96 = 42,791.78 : x
2. Step 2: Convert to fraction form
   72,988.58/100,724.96 = 42,791.78/x
3. Step 3: Cross multiply
   72,988.58x = 100,724.96 × 42,791.78
4. Step 4: Simplify right side
   72,988.58x = 4,310,200,328.83
5. Step 5: Solve for x
   x = 4,310,200,328.83/72,988.58
6. Step 6: Final answer
   x = 59,053.08