Finding the Fourth Proportional to 72,987.58, 100,723.58 and 42,790.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,987.58 : 100,723.58 = 42,790.78 : x
2. Step 2: Convert to fraction form
   72,987.58/100,723.58 = 42,790.78/x
3. Step 3: Cross multiply
   72,987.58x = 100,723.58 × 42,790.78
4. Step 4: Simplify right side
   72,987.58x = 4,310,040,552.59
5. Step 5: Solve for x
   x = 4,310,040,552.59/72,987.58
6. Step 6: Final answer
   x = 59,051.70