Finding the Fourth Proportional to 139,632.71, 209,461.41 and 39,790.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,632.71 : 209,461.41 = 39,790.71 : x
2. Step 2: Convert to fraction form
   139,632.71/209,461.41 = 39,790.71/x
3. Step 3: Cross multiply
   139,632.71x = 209,461.41 × 39,790.71
4. Step 4: Simplify right side
   139,632.71x = 8,334,618,221.50
5. Step 5: Solve for x
   x = 8,334,618,221.50/139,632.71
6. Step 6: Final answer
   x = 59,689.59