Finding the Fourth Proportional to 81,909.18, 122,790.69 and 31,977.72

Step by Step Solution

1. Step 1: Write the proportion equation
   81,909.18 : 122,790.69 = 31,977.72 : x
2. Step 2: Convert to fraction form
   81,909.18/122,790.69 = 31,977.72/x
3. Step 3: Cross multiply
   81,909.18x = 122,790.69 × 31,977.72
4. Step 4: Simplify right side
   81,909.18x = 3,926,566,303.43
5. Step 5: Solve for x
   x = 3,926,566,303.43/81,909.18
6. Step 6: Final answer
   x = 47,938.05