Finding the Fourth Proportional to 143,231,020.86, 214,693,568.37 and 81,687,661.91

Step by Step Solution

1. Step 1: Write the proportion equation
   143,231,020.86 : 214,693,568.37 = 81,687,661.91 : x
2. Step 2: Convert to fraction form
   143,231,020.86/214,693,568.37 = 81,687,661.91/x
3. Step 3: Cross multiply
   143,231,020.86x = 214,693,568.37 × 81,687,661.91
4. Step 4: Simplify right side
   143,231,020.86x = 17,537,815,626,186,562
5. Step 5: Solve for x
   x = 17,537,815,626,186,562/143,231,020.86
6. Step 6: Final answer
   x = 122,444,254.89