Finding the Fourth Proportional to 139,311.86, 209,003.16 and 64,485.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,311.86 : 209,003.16 = 64,485.98 : x
2. Step 2: Convert to fraction form
   139,311.86/209,003.16 = 64,485.98/x
3. Step 3: Cross multiply
   139,311.86x = 209,003.16 × 64,485.98
4. Step 4: Simplify right side
   139,311.86x = 13,477,773,595.70
5. Step 5: Solve for x
   x = 13,477,773,595.70/139,311.86
6. Step 6: Final answer
   x = 96,745.34