Finding the Fourth Proportional to 85,392.50, 128,085.98 and 38,645.37

Step by Step Solution

1. Step 1: Write the proportion equation
   85,392.50 : 128,085.98 = 38,645.37 : x
2. Step 2: Convert to fraction form
   85,392.50/128,085.98 = 38,645.37/x
3. Step 3: Cross multiply
   85,392.50x = 128,085.98 × 38,645.37
4. Step 4: Simplify right side
   85,392.50x = 4,949,929,895.69
5. Step 5: Solve for x
   x = 4,949,929,895.69/85,392.50
6. Step 6: Final answer
   x = 57,966.80