Finding the Fourth Proportional to 140,240.83, 210,437.78 and 81,191.83

Step by Step Solution

1. Step 1: Write the proportion equation
   140,240.83 : 210,437.78 = 81,191.83 : x
2. Step 2: Convert to fraction form
   140,240.83/210,437.78 = 81,191.83/x
3. Step 3: Cross multiply
   140,240.83x = 210,437.78 × 81,191.83
4. Step 4: Simplify right side
   140,240.83x = 17,085,828,136.22
5. Step 5: Solve for x
   x = 17,085,828,136.22/140,240.83
6. Step 6: Final answer
   x = 121,832.05