Finding the Fourth Proportional to 103,686.78, 143,036.55 and 65,973.18

Step by Step Solution

1. Step 1: Write the proportion equation
   103,686.78 : 143,036.55 = 65,973.18 : x
2. Step 2: Convert to fraction form
   103,686.78/143,036.55 = 65,973.18/x
3. Step 3: Cross multiply
   103,686.78x = 143,036.55 × 65,973.18
4. Step 4: Simplify right side
   103,686.78x = 9,436,576,059.73
5. Step 5: Solve for x
   x = 9,436,576,059.73/103,686.78
6. Step 6: Final answer
   x = 91,010.41