Finding the Fourth Proportional to 139,498.61, 209,216.39 and 39,656.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,498.61 : 209,216.39 = 39,656.59 : x
2. Step 2: Convert to fraction form
   139,498.61/209,216.39 = 39,656.59/x
3. Step 3: Cross multiply
   139,498.61x = 209,216.39 × 39,656.59
4. Step 4: Simplify right side
   139,498.61x = 8,296,807,878.19
5. Step 5: Solve for x
   x = 8,296,807,878.19/139,498.61
6. Step 6: Final answer
   x = 59,475.92