Finding the Fourth Proportional to 81,091.56, 121,467.84 and 65,210.70

Step by Step Solution

1. Step 1: Write the proportion equation
   81,091.56 : 121,467.84 = 65,210.70 : x
2. Step 2: Convert to fraction form
   81,091.56/121,467.84 = 65,210.70/x
3. Step 3: Cross multiply
   81,091.56x = 121,467.84 × 65,210.70
4. Step 4: Simplify right side
   81,091.56x = 7,921,002,873.89
5. Step 5: Solve for x
   x = 7,921,002,873.89/81,091.56
6. Step 6: Final answer
   x = 97,679.74