Finding the Fourth Proportional to 85,981.30, 128,968.49 and 43,860.47

Step by Step Solution

1. Step 1: Write the proportion equation
   85,981.30 : 128,968.49 = 43,860.47 : x
2. Step 2: Convert to fraction form
   85,981.30/128,968.49 = 43,860.47/x
3. Step 3: Cross multiply
   85,981.30x = 128,968.49 × 43,860.47
4. Step 4: Simplify right side
   85,981.30x = 5,656,618,051.40
5. Step 5: Solve for x
   x = 5,656,618,051.40/85,981.30
6. Step 6: Final answer
   x = 65,788.94