Finding the Fourth Proportional to 81,390, 112,308.72 and 47,405.94

Step by Step Solution

1. Step 1: Write the proportion equation
   81,390 : 112,308.72 = 47,405.94 : x
2. Step 2: Convert to fraction form
   81,390/112,308.72 = 47,405.94/x
3. Step 3: Cross multiply
   81,390x = 112,308.72 × 47,405.94
4. Step 4: Simplify right side
   81,390x = 5,324,100,441.80
5. Step 5: Solve for x
   x = 5,324,100,441.80/81,390
6. Step 6: Final answer
   x = 65,414.68