Finding the Fourth Proportional to 149,807.89, 206,734.56 and 86,145.69

Step by Step Solution

1. Step 1: Write the proportion equation
   149,807.89 : 206,734.56 = 86,145.69 : x
2. Step 2: Convert to fraction form
   149,807.89/206,734.56 = 86,145.69/x
3. Step 3: Cross multiply
   149,807.89x = 206,734.56 × 86,145.69
4. Step 4: Simplify right side
   149,807.89x = 17,809,291,770.25
5. Step 5: Solve for x
   x = 17,809,291,770.25/149,807.89
6. Step 6: Final answer
   x = 118,880.87