Finding the Fourth Proportional to 81,661.86, 122,377.86 and 64,947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   81,661.86 : 122,377.86 = 64,947.72 : x
2. Step 2: Convert to fraction form
   81,661.86/122,377.86 = 64,947.72/x
3. Step 3: Cross multiply
   81,661.86x = 122,377.86 × 64,947.72
4. Step 4: Simplify right side
   81,661.86x = 7,948,162,985.48
5. Step 5: Solve for x
   x = 7,948,162,985.48/81,661.86
6. Step 6: Final answer
   x = 97,330.17