Finding the Fourth Proportional to 72,985.58, 100,720.82 and 42,788.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,985.58 : 100,720.82 = 42,788.78 : x
2. Step 2: Convert to fraction form
   72,985.58/100,720.82 = 42,788.78/x
3. Step 3: Cross multiply
   72,985.58x = 100,720.82 × 42,788.78
4. Step 4: Simplify right side
   72,985.58x = 4,309,720,611.77
5. Step 5: Solve for x
   x = 4,309,720,611.77/72,985.58
6. Step 6: Final answer
   x = 59,048.94