Finding the Fourth Proportional to 85,830.30, 128,783.85 and 39,059.10

Step by Step Solution

1. Step 1: Write the proportion equation
   85,830.30 : 128,783.85 = 39,059.10 : x
2. Step 2: Convert to fraction form
   85,830.30/128,783.85 = 39,059.10/x
3. Step 3: Cross multiply
   85,830.30x = 128,783.85 × 39,059.10
4. Step 4: Simplify right side
   85,830.30x = 5,030,181,275.54
5. Step 5: Solve for x
   x = 5,030,181,275.54/85,830.30
6. Step 6: Final answer
   x = 58,606.12