Finding the Fourth Proportional to 149,858.34, 206,810.72 and 86,196.21

Step by Step Solution

1. Step 1: Write the proportion equation
   149,858.34 : 206,810.72 = 86,196.21 : x
2. Step 2: Convert to fraction form
   149,858.34/206,810.72 = 86,196.21/x
3. Step 3: Cross multiply
   149,858.34x = 206,810.72 × 86,196.21
4. Step 4: Simplify right side
   149,858.34x = 17,826,300,251.37
5. Step 5: Solve for x
   x = 17,826,300,251.37/149,858.34
6. Step 6: Final answer
   x = 118,954.34