Finding the Fourth Proportional to 140,135.27, 210,276.72 and 81,012.47

Step by Step Solution

1. Step 1: Write the proportion equation
   140,135.27 : 210,276.72 = 81,012.47 : x
2. Step 2: Convert to fraction form
   140,135.27/210,276.72 = 81,012.47/x
3. Step 3: Cross multiply
   140,135.27x = 210,276.72 × 81,012.47
4. Step 4: Simplify right side
   140,135.27x = 17,035,035,419.31
5. Step 5: Solve for x
   x = 17,035,035,419.31/140,135.27
6. Step 6: Final answer
   x = 121,561.37