Finding the Fourth Proportional to 85,643.39, 128,501.82 and 33,089.78

Step by Step Solution

1. Step 1: Write the proportion equation
   85,643.39 : 128,501.82 = 33,089.78 : x
2. Step 2: Convert to fraction form
   85,643.39/128,501.82 = 33,089.78/x
3. Step 3: Cross multiply
   85,643.39x = 128,501.82 × 33,089.78
4. Step 4: Simplify right side
   85,643.39x = 4,252,096,953.40
5. Step 5: Solve for x
   x = 4,252,096,953.40/85,643.39
6. Step 6: Final answer
   x = 49,648.86