Finding the Fourth Proportional to 139,311.82, 208,967.73 and 56,147.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,311.82 : 208,967.73 = 56,147.50 : x
2. Step 2: Convert to fraction form
   139,311.82/208,967.73 = 56,147.50/x
3. Step 3: Cross multiply
   139,311.82x = 208,967.73 × 56,147.50
4. Step 4: Simplify right side
   139,311.82x = 11,733,015,620.18
5. Step 5: Solve for x
   x = 11,733,015,620.18/139,311.82
6. Step 6: Final answer
   x = 84,221.25