Finding the Fourth Proportional to 140,357.83, 210,480.71 and 81,235.02

Step by Step Solution

1. Step 1: Write the proportion equation
   140,357.83 : 210,480.71 = 81,235.02 : x
2. Step 2: Convert to fraction form
   140,357.83/210,480.71 = 81,235.02/x
3. Step 3: Cross multiply
   140,357.83x = 210,480.71 × 81,235.02
4. Step 4: Simplify right side
   140,357.83x = 17,098,404,686.46
5. Step 5: Solve for x
   x = 17,098,404,686.46/140,357.83
6. Step 6: Final answer
   x = 121,820.10