Finding the Fourth Proportional to 85,474.73, 128,109.69 and 39,820.91

Step by Step Solution

1. Step 1: Write the proportion equation
   85,474.73 : 128,109.69 = 39,820.91 : x
2. Step 2: Convert to fraction form
   85,474.73/128,109.69 = 39,820.91/x
3. Step 3: Cross multiply
   85,474.73x = 128,109.69 × 39,820.91
4. Step 4: Simplify right side
   85,474.73x = 5,101,443,795.07
5. Step 5: Solve for x
   x = 5,101,443,795.07/85,474.73
6. Step 6: Final answer
   x = 59,683.65