Finding the Fourth Proportional to 85,433.94, 128,061.75 and 29,257.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,433.94 : 128,061.75 = 29,257.50 : x
2. Step 2: Convert to fraction form
   85,433.94/128,061.75 = 29,257.50/x
3. Step 3: Cross multiply
   85,433.94x = 128,061.75 × 29,257.50
4. Step 4: Simplify right side
   85,433.94x = 3,746,766,650.63
5. Step 5: Solve for x
   x = 3,746,766,650.63/85,433.94
6. Step 6: Final answer
   x = 43,855.72