Finding the Fourth Proportional to 72,986.58, 100,722.20 and 42,789.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,986.58 : 100,722.20 = 42,789.78 : x
2. Step 2: Convert to fraction form
   72,986.58/100,722.20 = 42,789.78/x
3. Step 3: Cross multiply
   72,986.58x = 100,722.20 × 42,789.78
4. Step 4: Simplify right side
   72,986.58x = 4,309,880,779.12
5. Step 5: Solve for x
   x = 4,309,880,779.12/72,986.58
6. Step 6: Final answer
   x = 59,050.32