Finding the Fourth Proportional to 72,892.10, 100,619.31 and 56,981.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,892.10 : 100,619.31 = 56,981.68 : x
2. Step 2: Convert to fraction form
   72,892.10/100,619.31 = 56,981.68/x
3. Step 3: Cross multiply
   72,892.10x = 100,619.31 × 56,981.68
4. Step 4: Simplify right side
   72,892.10x = 5,733,457,286.37
5. Step 5: Solve for x
   x = 5,733,457,286.37/72,892.10
6. Step 6: Final answer
   x = 78,656.77