Finding the Fourth Proportional to 149,012.16, 205,636.78 and 85,354.05

Step by Step Solution

1. Step 1: Write the proportion equation
   149,012.16 : 205,636.78 = 85,354.05 : x
2. Step 2: Convert to fraction form
   149,012.16/205,636.78 = 85,354.05/x
3. Step 3: Cross multiply
   149,012.16x = 205,636.78 × 85,354.05
4. Step 4: Simplify right side
   149,012.16x = 17,551,932,399.67
5. Step 5: Solve for x
   x = 17,551,932,399.67/149,012.16
6. Step 6: Final answer
   x = 117,788.59