Finding the Fourth Proportional to 140,280.64, 210,486.56 and 81,166.02

Step by Step Solution

1. Step 1: Write the proportion equation
   140,280.64 : 210,486.56 = 81,166.02 : x
2. Step 2: Convert to fraction form
   140,280.64/210,486.56 = 81,166.02/x
3. Step 3: Cross multiply
   140,280.64x = 210,486.56 × 81,166.02
4. Step 4: Simplify right side
   140,280.64x = 17,084,356,338.69
5. Step 5: Solve for x
   x = 17,084,356,338.69/140,280.64
6. Step 6: Final answer
   x = 121,786.99