Finding the Fourth Proportional to 85,772.34, 128,685 and 38,427.30

Step by Step Solution

1. Step 1: Write the proportion equation
   85,772.34 : 128,685 = 38,427.30 : x
2. Step 2: Convert to fraction form
   85,772.34/128,685 = 38,427.30/x
3. Step 3: Cross multiply
   85,772.34x = 128,685 × 38,427.30
4. Step 4: Simplify right side
   85,772.34x = 4,945,017,100.50
5. Step 5: Solve for x
   x = 4,945,017,100.50/85,772.34
6. Step 6: Final answer
   x = 57,652.82