Finding the Fourth Proportional to 86,074.09, 128,714.76 and 81,875.05

Step by Step Solution

1. Step 1: Write the proportion equation
   86,074.09 : 128,714.76 = 81,875.05 : x
2. Step 2: Convert to fraction form
   86,074.09/128,714.76 = 81,875.05/x
3. Step 3: Cross multiply
   86,074.09x = 128,714.76 × 81,875.05
4. Step 4: Simplify right side
   86,074.09x = 10,538,527,410.74
5. Step 5: Solve for x
   x = 10,538,527,410.74/86,074.09
6. Step 6: Final answer
   x = 122,435.54