Finding the Fourth Proportional to 72,978.21, 100,715.67 and 40,723.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,978.21 : 100,715.67 = 40,723.02 : x
2. Step 2: Convert to fraction form
   72,978.21/100,715.67 = 40,723.02/x
3. Step 3: Cross multiply
   72,978.21x = 100,715.67 × 40,723.02
4. Step 4: Simplify right side
   72,978.21x = 4,101,446,243.72
5. Step 5: Solve for x
   x = 4,101,446,243.72/72,978.21
6. Step 6: Final answer
   x = 56,200.97