Finding the Fourth Proportional to 86,074.52, 128,715.42 and 81,875.48

Step by Step Solution

1. Step 1: Write the proportion equation
   86,074.52 : 128,715.42 = 81,875.48 : x
2. Step 2: Convert to fraction form
   86,074.52/128,715.42 = 81,875.48/x
3. Step 3: Cross multiply
   86,074.52x = 128,715.42 × 81,875.48
4. Step 4: Simplify right side
   86,074.52x = 10,538,637,117.69
5. Step 5: Solve for x
   x = 10,538,637,117.69/86,074.52
6. Step 6: Final answer
   x = 122,436.20