Finding the Fourth Proportional to 80,131.56, 120,188.16 and 20,972.94

Step by Step Solution

1. Step 1: Write the proportion equation
   80,131.56 : 120,188.16 = 20,972.94 : x
2. Step 2: Convert to fraction form
   80,131.56/120,188.16 = 20,972.94/x
3. Step 3: Cross multiply
   80,131.56x = 120,188.16 × 20,972.94
4. Step 4: Simplify right side
   80,131.56x = 2,520,699,068.39
5. Step 5: Solve for x
   x = 2,520,699,068.39/80,131.56
6. Step 6: Final answer
   x = 31,457.01