Finding the Fourth Proportional to 139,499.61, 209,217.88 and 39,657.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,499.61 : 209,217.88 = 39,657.59 : x
2. Step 2: Convert to fraction form
   139,499.61/209,217.88 = 39,657.59/x
3. Step 3: Cross multiply
   139,499.61x = 209,217.88 × 39,657.59
4. Step 4: Simplify right side
   139,499.61x = 8,297,076,905.71
5. Step 5: Solve for x
   x = 8,297,076,905.71/139,499.61
6. Step 6: Final answer
   x = 59,477.42